The controller will retrieve all the endpoints at the beginning of its
loop. When changes need to be applied, the provider may need to query
the endpoints again. Allow the provider to skip the queries if its data was
cached.
* 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
* 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
* 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(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
