internal: fix net.Dial fail without IP (#4037)
internal: fix net.Dial fail without IP (#4037)


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