Before this, the command always succeeded, even if races were found.
I'm grepping over the output of go test -race to check if there is race because there is no other way to distinguish between a found race and a flaky test.
There is no proto3 compiler for PHP yet, but the wire format of proto3
is backward-compatible with proto2. To avoid maintaining two copies of
our proto files, we use a translator to make the simple syntax changes
necessary to work in PHP's proto2 compiler.
Service stubs are not generated, since I haven't plugged in gRPC yet.