Delete files in apis, not api
Delete files in apis, not api

Also, make the compgen invocation silent.

(Coincidentally, this was caught by an API changing in a way that *required* an old file to be deleted...)

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