Fix resolver.ClientConnection to resolver.ClientConn (#3288)
Fix resolver.ClientConnection to resolver.ClientConn (#3288)


grpc/grpc-go,dfawley/grpc-go,grpc/grpc-go,stanley-cheung/grpc-go,menghanl/grpc-go,stanley-cheung/grpc-go,dfawley/grpc-go,menghanl/grpc-go