Use a unique name in the test to avoid slowness.
Use a unique name in the test to avoid slowness.

Change-Id: I22fc18aea4f35b9b8614659b0fd1c1a72dcdbf34

GoogleCloudPlatform/dotnet-docs-samples,GoogleCloudPlatform/dotnet-docs-samples,jsimonweb/csharp-docs-samples,jsimonweb/csharp-docs-samples,GoogleCloudPlatform/dotnet-docs-samples,jsimonweb/csharp-docs-samples,GoogleCloudPlatform/dotnet-docs-samples,jsimonweb/csharp-docs-samples