Fix how excluded files are found (#384)
Fix how excluded files are found (#384)

Also log the result, as a small but handy piece of diagnostics.
iantalarico/google-cloud-dotnet,googleapis/google-cloud-dotnet,chrisdunelm/gcloud-dotnet,benwulfe/google-cloud-dotnet,iantalarico/google-cloud-dotnet,jskeet/google-cloud-dotnet,iantalarico/google-cloud-dotnet,ctaggart/google-cloud-dotnet,googleapis/google-cloud-dotnet,ctaggart/google-cloud-dotnet,benwulfe/google-cloud-dotnet,benwulfe/google-cloud-dotnet,googleapis/google-cloud-dotnet,ctaggart/google-cloud-dotnet,jskeet/google-cloud-dotnet,chrisdunelm/google-cloud-dotnet,jskeet/google-cloud-dotnet,chrisdunelm/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,evildour/google-cloud-dotnet,chrisdunelm/google-cloud-dotnet,evildour/google-cloud-dotnet,jskeet/gcloud-dotnet,evildour/google-cloud-dotnet