Update synth.metadata for Dataproc so that autosynth works
Update synth.metadata for Dataproc so that autosynth works

(The need for this is temporary, while autosynth is being fixed.)

googleapis/google-cloud-dotnet,jskeet/gcloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,googleapis/google-cloud-dotnet,jskeet/google-cloud-dotnet,googleapis/google-cloud-dotnet