* Add part 1 watch functionality. (squashed)
* add funcs for service/endpoint fqdns
* add endpoints watch
* document exposed funcs
* only send subset deltas
* locking for watch map
* tests and docs
* add pod watch
* remove debugs prints
* feedback part 1
* add error reporting to proto
* inform clients of server stop+errors
* add grpc options param
* use proper context
* Review feedback:
* Removed client (will move to another repo)
* Use new log functions
* Change watchChan to be for string not []string
* Rework how k8s plugin stores watch tracking info to simplify
* Normalize the qname on watch request
* Add blank line back
* Revert another spurious change
* Fix tests
* Add stop channel.
Fix tests.
Better docs for plugin interface.
* fmt.Printf -> log.Warningf
* Move from dnsserver to plugin/pkg/watch
* gofmt
* remove dead client watches
* sate linter
* linter omg
