test: use channelz instead of stats handler to determine RPC count (#5275)
test: use channelz instead of stats handler to determine RPC count (#5275)


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