vet: ignore status code from grep -L (#3016)
vet: ignore status code from grep -L (#3016)


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