Create management API stub harness


Create a small development utility that can be substituted in configuration to act as the management API gateway. This should run as a separate test harness application. When configured to use this harness the greybox utility would make calls to this local app instead of the actual management API. This will help test local interactions in the UI without having to deploy to the Azure environment for testing.

This is not a replacement for unit tests and mocking in unit tests. This is more for testing interactions in the UI when adding features.