Add common config to be shared by both azure and azure-private-dns providers
Update tests & docs

* Added label filter for source CRD

* Fixed bug with labels and added tests for source CRD

* Fixed formating

* Update source/crd_test.go
Co-authored-by: Vinny Sabatini <vincent.sabatini@gmail.com>
Co-authored-by: Vinny Sabatini <vincent.sabatini@gmail.com>

When it syncs AWS DNS with k8s cluster content (at `--interval`), external-dns submits two distinct Route53 API calls:
* to fetch available zones (eg. for tag based zones discovery, or when zones are created after exernal-dns started),
* to fetch relevant zones' resource records.

Each call taxes the Route53 APIs calls budget (5 API calls per second per AWS account/region hard limit), increasing the probability of being throttled.
Changing synchronization interval would mitigate those calls' impact, but at the cost of keeping stale records for a longer time.

For most practical uses cases, zones list aren't expected to change frequently.
Even less so when external-dns is provided an explicit, static zones set (`--zone-id-filter` rather than `--aws-zone-tags`).

Using a zones list cache halves the number of Route53 read API calls.

Signed-off-by: Patrik Cyvoct <patrik@ptrk.io>

Support wildcard records - Optional ability to replace the asterisk in generated registry TXT records with another string

* intial removal of inappropriate terminology
Signed-off-by: Raffaele Di Fazio <raffo@github.com>

* removed other occurrences
Signed-off-by: Raffaele Di Fazio <raffo@github.com>

* gofmt
Signed-off-by: Raffaele Di Fazio <raffo@github.com>

* addresses comment
Signed-off-by: Raffaele Di Fazio <raffo@github.com>

* gofmt
Signed-off-by: Raffaele Di Fazio <raffo@github.com>

To run:

provide token HETZNER_TOKEN in ENV
set command line parameter --provider=hetzner

Signed-off-by: Raffaele Di Fazio <difazio.raffaele@gmail.com>

 - OVH Provider
 - Tests
 - Documentations

add documentation for kube-ingress-aws-controller and RouteGroup
Signed-off-by: Sandor Szücs <sandor.szuecs@zalando.de>

This moves `domain_filter.go` to the `endpoint` package to make it
possible to filter and exclude record names in
`plan.filterRecordsForPlan()` so it does not have to be implemented in
every single provider.

Because some providers access `DomainFilter.filters` directly it had to
be exported.

* Updated TTL variable type to int64
* Updated rfc2136 contructor to have nil as last variable
* Removed unnecessary variable `data`

Add --events flag to use informers to automatically trigger sync loop on adds/updates/deletes for supported ingress and service sources.

The parameter is google-batch-change-interval.
Default value is 2s.

* Move into kubernetes-sigs organization

* Disable labeler action for forks

The parameter is google-batch-change-size.
Default value is 1000.