* Create `NewAWSProvider` with `AWSConfig` struct

Rather than calling `NewAWSProvider` with a list of objects, you will
now call it using a new `AWSConfig` struct. This allows for clearer
declarations of variables which becomes even  more important as more
variables are added.

* Add `aws-max-change-count` flag

Adding a new `aws-max-change-count` flag to override the default max
change count on the aws provider.

Included updated tests with a new `defaultMaxChangeCount` constant and
tests for setting the value as a flag and as an environment variable.

* Update CHANGELOG.md

Updating CHANGELOG.md with 'Add aws max change count flag' PR.

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

* Add new connector source

* Update docs for connector source

Commit adds:
* Implementation of PowerDNS as a provider
* Tests for said implementation
* github.com/ffledgling/pdns-go, which provides go client bindings for
  PowerDNS's HTTP API, as a dependency
* "pdns" as an additional option for the `--provider` flag
* `--pdns-server` and `--pdns-api-key` as additional flags for PowerDNS
  specific configuration

* Add a flag that allows FQDN and Annotations to combine

Old behaviour is kept by default, a new flag is introduced to combine instead of overwrite

Fixes #218

* docs: add fqdn template combine to changelog

* Graceful handling of misconfigure password for dyn

If a bad password is given for provider "dyn" then the next
login attempt is at least 30minutes apart. This prevents an
account from being suspended.

Improve validation of flags for dyn provider. Add test for
ValidateConfig() and Config.String()

Also add --dyn-min-ttl option which sets the lower limit
of a record's TTL. Ignored if 0 (the default).

* docs: add graceful handling of misconfiguration to changelog

* Don't log passwords on start

The two passwords configurable as flags (for infoblox and dyn) are
masked now and not logged.

* docs: add masking sensitive data in logs to changelog

* add "dyn" provider
* add several --dyn-* args to configure Dyn login
* add github.com/nesv/go-dynect/dynect@0.6.0 to Gopkg and vender/ (the client
  of choice by Terraform)
* make externdns.Version public so it can be stored when committing
  zone changes
* add tutorial for Ingress resources and update root README.md file

Dyn REST API is documented here: https://help.dyn.com/dns-api-knowledge-base/

Example usage:

  external-dns \
    --provider=dyn \
    --dyn-customer-name=acme \
    --dyn-username=acme-api \
    --dyn-password=t0pS3cr3t \
    --domain-filter=portal.acme.com \
    --zone-id-filter=acme.com \
    --namespace=my-test-ns \
    --log-level=debug \
    --txt-prefix=_

* Add aws-zone-id flag

* Add Zone ID filter

* Update AWS provider and main

* Make ZoneIDFilter generic

* Implement ZoneIDFilter for all providers

* Update CHANGELOG

This commit adds ability to use TLS transport for etcd.
New logic is applied when the etcd URL has https:// scheme.
TLS parameters are passed in the environment variables:

ETCD_CA_FILE - path to CA certificate. If not specified, then
system-provided certificates are used.

ETCD_CERT_FILE - client certificate
ETCD_KEY_FILE - client key file
- either both of none of this two must be specified

ETCD_TLS_SERVER_NAME - expected CN of the certificate. Useful when
URL points to a different domain from that in server certificate

ETCD_TLS_INSECURE - if set to "1" (or "true" or "yes") makes client
bypass server certificate validation.

Also for unification with other providers and rest of connection
settings, etcd URL is no longer specified in the command line, but
rather in ETCD_URLS environment variable (defaults to
http://localhost:2379). More than one comma-separated URL can be
specified. All of the URLs must start with either http:// or https://

Also, now it possible to communicate with etcd through proxy specified
in standard environment variables

* allow filtering by ingress class

* generic source annotation filter as opposed to ingress class filter

* rename and fix argument ordering, switch to label selector semantics

* remove redundant parameters

This commit adds support for CoreDNS through its etcd middleware.
Because the middleware is backward compatible with SkyDNS this
commit adds support for SkyDNS as well. In fact, new provider
is available under two names in CLI (coredns and skydns).

All interactions with middleware happen through etcd cluster,
whose location (URIs) is specified via --etcd CLI parameter
by default http://localhost:2379).

The provider translates CoreDNS/DkyDNS SRV records to
A/CNAME + optional TXT endpoints, when reading from etcd and
combines A/CNAME with TXT endpoints back into single SRV record
when writing it back.

Also adds github.com/coreos/etcd package to glide.yaml and vendor folder
because it is used by the provider

- Add `--inmemory-zone flag`
- Implement `InMemoryZoneInit` function to setup initial zones for
  inmemory provider
- Make "" the default zone for the inmemory provider instead of
  nil/none when no initial zones are specified
- Update config/flag parsing tests to accept new flag

* Initial commit of Infoblox provider

* address @ideahitme's observations

* fail at addressing @szuecs comments

* fix(infoblox): avoid shadowing err variable

* fix flag descriptions

* default ssl verify to true. thanks @szuecs

* chore(infoblox): bump minium required version

This should ideally be a minor bump but let's do that when we have v0.5

* Adds Dnsimple as a provider

* chore(vendor): remove vendor for smaller diff

* fix(config): make dnsimple selectable via flags

* Fix delete and update

* Dnsimple testify mock tests

* remove leaked file

* Move and simplify mock functions

* chore: use lowercase for logrus repository

* chore: update dependencies using glide

* chore: vendor dnsimple-go package

* ref: isolate suitable type in source package

* add support for DNSimple, thx @jose5918 :D

* chore: use lowercase for logrus repository

* chore: update dependencies using glide

* Add a new --cloudflare-proxied flag to toggle Cloudflare proxy feature

* Change flag description

* ClusterIP service support

- First pass at addresssing #187 by allowing services with type ClusterIP to be directly supported

* Getting existing tests to pass

* Adjusting formatting for gofmt/govet

* Adding in guard logic around publishing of ClusterIP sources

* Addressing PR feedback

* Adding in CHANGELOG entry

* Adding in Headless service test

* ref(sources): refactor source registration and lookup to be lazy.

* fix(fake): don't make changes to passed in config values

* rework without init, tests are missing

* make client provider public

* fix all tests

* change parameter list order, minor improvements

* clientprovider -> clientgenerator, switch naming for interface/struct

* Support for multiple domains within --domain-filter

The parameter accepts a comma separated list of domains with or without trailing dot. Example: --domain-filter="example.org, company.test.,staging.com". Closes #247 and #229

* Add boilerplate header

* Add documentation for methods and structs

* use StringsVar for the domain-filter flag

* go fmt

* Remove camel case from tests

* Revert changes in README.md

* Move DomainFilter to provider package

* Make a new slice and copy elements to it

* Update CHANGELOG.md

* docs: change minor spelling mistake

* CloudFlare Provider

* updating glide

* gofmt cloudflare_test.go

* Unset envs to test NewCloudFlareProvider

* More tests

* fix(cloudflare): fix compiler errors resulting from merge

* Typo

* Undo vendor changes

* decrease api calls, fix some nits

* Cloudflare iteration (#2)

* reduce the number of API calls

* match by type and name for record id

* improve coverage and fix the bug with suitable zone

* tests failed due to wrong formatting

* add cloudflare integration to the main

* vendor cloudflare deps

* fix cloudflare zone detection + tests

* fix conflicting test function names

* Initial Digital Ocean as a new provider

* chore: vendor dependencies

* Remove zone parameter from ApplyChanges and Records

* fix(digitalocean): fix correct imports, unshadow a variable

* fix(digitalocean): respect domain-filter if provided

* add changes to digital ocean provider from PR review (#3)

* fix tests and bugs in find suitable zones for digital ocean (#5)

* tests failed due to wrong formatting

* add digitalocean integration to the main and more tests

* fix suitable zone for digital ocean

* fix: Load all known Kubernetes Auth Plugins

* chore: vendor CoreOS' oidc library

* vendor Azure Go SDK (#210)

* vendor the Azure Go SDK and dependencies

* add initial Azure DNS provider implementation (#210)

* add 'azure' value to 'provider' command line option
* add 'azure-config-file' command line option
* add 'azure-resource-group' command line option
* implement initial Azure DNS provider

note: azure provider is not yet fully implemented (does not query for existing
records).

tests and documentation are forthcoming.

* add a tutorial for the Azure provider (#210)

* add tutorial for using ExternalDNS with Azure DNS

* finish implementation of Azure DNS provider (#210)

* implement the Records method for the Azure DNS provider

* refactor Azure API interface for future tests (#210)

* make Azure provider use an interface for future unit tests

* add unit tests for the Azure provider (#210)

* test retrieving Azure DNS records.
* test updating and deleting Azure DNS records.
* test dry run for the Azure provider (i.e. noop).

* Expose inmemory provider to cli

So we can test `--source fake` without needing to touch AWS/Google.

* Add FakeSource

`external-dns --provider inmemory --source fake --dry-run --once`

OR

`external-dns --provider aws --source fake --fqdn-template <hostname suffix> --dry-run --once`

NB: `--fqdn-template` because otherwise we'll default to creating, e.g.,
`abcd.example.com`, which `--provider aws` filters out because you
likely don't have a Zone for `example.com.`  Could also be resolved by
removing the need to use a real provider; the inmemory provider,
perhaps, though it's not entirely hooked up.

Closes kubernetes-incubator/external-dns#22

* Style feedback from Travis CI

* Improve optionality of kubernetes client

* ref(sources): refactor source registration and lookup to be lazy.

* Revert "ref: refactor source registration/lookup to be lazily initialized"

* chore: add instrumented HTTP client library

* feat: add client-side metrics to outgoing HTTP clients

* feat: add and use a deduplicating source

* chore: add log entry when endpoint was deduplicated

* feat(config): change defaults, switch flag processing to kingpin

* chore: vendor kingpin as a dependency

* feat(config): auto-detect cluster config from the environment

* chore: clean up definition of flags

* chore: sanitize flags even further

* chore: update changelog with latest flags changes

* fix(aws): fix messed up test name

* minor improvements to logging

* chore(*): change log.Infoln to log.Info

* fix: fix incorrect example code