Delete dotnet-powerpack.sln
Delete dotnet-powerpack.sln

We no longer need this solution file; there's one for templates under the templates directory.
GoogleCloudPlatform/google-cloud-dotnet-powerpack,GoogleCloudPlatform/google-cloud-dotnet-powerpack,GoogleCloudPlatform/google-cloud-dotnet-powerpack,GoogleCloudPlatform/google-cloud-dotnet-powerpack