resolver.UnregisterForTesting removed

[redloaf]

resolver.UnregisterForTesting was removed in #6471. This was part of the public API and was removed with no deprecation notice. The discussion in the PR notes that it was previously used in internal Google code, but it is used in other places.

[dfawley]

The whole package is clearly declared as experimental and is subject to change. Let us know if you need help finding a workaround.

grpc-go/resolver/resolver.go

Lines 19 to 21 in 9deee9b

	// Package resolver defines APIs for name resolution in gRPC.
	// All APIs in this package are experimental.
	package resolver