Add categories to live and simulated tests
Updated Identity Service references in the User Guide
Create base class SimulatedService to simplify simulated service development
Update service catalog to indicate simulated services run on localhost
Log errors even when SuppressOutput is true
Update simulated tests to facilitate use of multiple services in future tests
Refactor BaseIdentityTests to use the same Live and Simulated test code
Refactor IdentityV2Tests to use the same Live and Simulated test code
Sign test projects with the SDKTestingKey