* provider=google: Improve Logging / Filter Endpoints

1. move dry-run exit after `separateChange()`
2. log records after `separateChange()`
3. make `newRecords()` a method of `GoogleProvider` — use `domainFilter.Match()` foreach `endpoint.DNSName`
   ^ without this, non-relevant endpoints show up in the warnings for “No matching zone”

* provider=google: Add tests for domainFilter

- new test: `TestGoogleRecordsFilter`
- add no matching zone and filtered record to `TestGoogleApplyChanges`
- allow `setupGoogleRecords` to createRecords without validateEndpoints

* provider=google: Improve zone-matching logs

- Add `DomainFilter.isConfigured()`
- Conditionally log zone matching for the user based off of `DomainFilter.isConfigured()`
- Rename `provider.newRecords()` to `provider.newFilteredRecords`

* fix: ensure that our setup methods are correct by keeping the tests

* Update AWS private hosted zones in addition to public zone

* Sort slices for consistent ordering in TestAWSSuitableZones

* ref: use len to check for empty list of matched zones

* feat: mention contributors in changelog

* fix: move changelog entry to the unreleased section

* fix: add one more missing attribution to the changelog

* Add aws-zone-id flag

* Add Zone ID filter

* Update AWS provider and main

* Make ZoneIDFilter generic

* Implement ZoneIDFilter for all providers

* Update CHANGELOG

* Make suitableType() be Endpoint method

With this change it becomes possible to work with endpoint
of empty type in packages other than "provider". Also
it seems logical for a smart property getter without side effects
to be a method rather than a function in different package

* Make plan computation work correctly with multi-target domains

* fix drawing

* drop comments

* fix boilerplate header

* fix comment

* fix the bug with empty map

* rework registry to support random lables

*  serialize->serializeLabel function rename

* golint for err variable naming

* add additional test

* add tests for current case where one resource can generate multiple endpoints

* make labels have its own type, add serialization as a method

* add comment for exported error

* use greater rather than not equal zero

* update changelog

Use `int64(ep.RecordTTL)` in `newRecord()`
Fallback to hardcoded 300s for backwards-compat
Add `TestNewRecords()`
Add notes in *ttl.md*

* Cloudflare: Disable proxy mode for TXT and others

* Improve code according to review

* Add test

* Disable proxy mode for wildcards

* Fix review, add test

* Move var

* chore: fix some golang related stuff

* chore: update changelog to reflect latest changes

* Add RecordTTL

* Route53: test for custom TTL

* Fix tests

* Fix remaining tests

* Add ttl when endpoint is created from ingress

* Missed a word

* Fix bad refactoring

* Add ingress custom TTL test

* gofmt

* Satisfy go-lint

* Unshadow `endpoint` in azure provider

* Fix and add an output test

* Add TTL for endpoints generated from service templates

* Take TTL into account when generating update plan

* Tests for TTL change impact on the plan

* Refactor factory method name

* Refactoring

* Run gofmt

* Make endpoint string format look like BIND config

* Update plan and plan_test

* Replace NewEndpointWithTTLValue with NewEndpointWithTTL in aws

* Remove NewEndpointWithTTLValue func

* Update references to TTL

* Remove getTTLValue func

* Handle merge conflict

* Update tests

* Update README, CHANGELOG and documentation

* Run gofmt

* Move getTTLFromAnnotations to a common file

* Refactor getTTLFromAnnotations

* Gofmt

* Add tests for getTTLFromAnnotations

* Trigger build

* Add boilerplate header

* Update README/CHANGELOG according to code review

* Add ttl.md and link it from README

* change CNAME string to endpoint.RecordTypeCNAME

* fix test cases with AWS ALIAS records, these do not behave different in these tests

* 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

* 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

If the user has specified a target for the ingress, treat that as
overriding any endpoints already set on the ingress, even if that list
is not empty.  This allows overriding the IP address or hostname set
when using a service like kube-keepalived-vip.

* docs(tutorials): add tutorial for digital ocean

* docs(tutorials): fix version used in cloudflare tutorial

* chore: update the changelog with the latest and greatest, thanks to all who contributed

* service source: support for multiple hostnames per annotation

* go fmt

* Make parseHostnameAnnontations inline

* Update CHANGELOG.md

* Update Changelog

* 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

* 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

* feat(google): auto-detect and multiple zone support

* chore: run gofmt with the simplified command

* fix: pass desired domain to google provider

* feat(google): correctly auto-detect records for sub-zones

* chore: update changelog with support for multiple zones in google

* fix(google): don't append traling dot to TXT records

* ref(provider): extract hostname sanitization to general provider

* continue on controller loop error

* add logging in source

* use formatter on logChanges for endpoints

* fix log messages, log skipped records

* add logging in aws, uppercase the rest

* respect google dry run policy

* add ing/svc namespace/name on logging

* fix error logging on template failure

* fix bugs, propagate template error

* log if nothing is being updated, debug log skipped endpoints

* change zone-not-found logging order

* add --fqdn-template

* add missing ,

* gofmt

* no endpoint creation on empty fqdntemplate

* improve test coverage

* gofmt simple on service_test.go and ingress_test.go

* import package order changed

* gofmt

* refactor to generate template in the source init

* refactor for err handling

* fix service tests

* fix wrong check, check for priorities, mate > template

* fix tests, check for controller annotation in the right place

* add to changelog

* add flag description, improve testing, reorganize imports

* review changes: log the error, use text/template, change func interface

* feat(aws): support multiple hosted zones and automatic lookup

* chore: run gofmt with the simplified command

* fix(aws): add missing method from google provider

* fix: remove superflous parameter from google provider

* feat: make domain configurable via flag

* fix(aws): remove unused constant

* fix(aws): don't log actions that were filtered out

* feat(aws): detect best possible zone to put dns entries in

* fix(aws): log error instead of failing if a change batch fails

* chore: update changelog with support for multiple zones

* feat(aws): support for creating DNS records with ALIAS type

* fix(aws): increase code coverage by listing ALIAS records

* chore: update changelog with support for ALIAS records

* ref(aws): generalize naming of ELB to load balancer

* ref(google): remove superflous check for non-existing record

* fix(aws): return the correctly typed alias record

* feat(plan): allow plans to be parameterized via policies

* fix(controller): set a policy in the controller tests

* chore: allow go tip to fail

* chore: update changelog to include policies

* fix(plan): store a pointer to changes

* fix(controller): don't get address of a pointer

* kickoff txt registry

* fix inmemory dns provider to include recordtype info for validation

* Merge master

* fix ununsed variable in inmemory provider

* add tests for records

* add test for no prefix name formatter

* implement apply changes with tests

* add flag to enable txt registry

* add txt registry to main

* improve sort testing

* filter out non-owned records

* NewEndpoint(...) requires record type

* use newendpoint in aws_test, fix tests

* change suitable type implementation

* fix the test for compatibility component

* change inmemory provider to include recordtype and use suitable type

* fix comments, CNAME should target hostname

* name mapper do not use pointer on struct

* txt prefix - just concatenate, remove spew, fix txt record label

* allow TXT records as result from dns provider

* add changelog

* fix tests

* TXT records need to be enclosed in double quotes

* feat: expose basic go metrics via prometheus

* chore: vendor dependencies

* feat(metrics): combine healthz and metrics into single endpoint

* ref(metrics): rename metrics port to address

* docs(metrics): update changelog to include metrics feature

* ref(metrics): consistently rename port to address

* feat(aws): support hostnames as endpoint targets

* docs: describe how to run ExternalDNS on AWS

* docs: update changelog with CNAME feature

* docs: update changelog to include AWS documentation

* fix(aws): test that updating records removes the old value

* feat(google): add CNAME support to Google provider

* fix(source): sanitize source and target hostnames

* docs: update changelog to include latest changes

* docs(aws): mention that ExternalDNS takes full ownership of a hosted zone

* fix(aws): switch route53 tests to use endpoint pointers

* docs: add TODO to remove record filtering once ownership is in place

* docs: add a CHANGELOG.md

* fix: add date to changelog