[Event Hubs] Migrate Client Code into Central Repository

[jsquire]

• Perform the initial restructuring of the repository to isolate the management library.

• Ensure that the management library can be built and that tests continue to pass after the restructure.

• Migrate the Event Hubs client source into the central repository.

• Restructure the client library to integrate with the engineering system, ensuring that it can be build and that tests continue to pass.

• Remove, update, or create assets for the client library, such that there is clean integration with the established standards of the central repository.

• Categorize each test from the client library test suite such that any tests which require connectivity to Azure in order to be valid are denoted with a trait named TestCategory and value of Live.

• Ensure that the client library can be built and that tests continue to pass after the initial adoption.

[jsquire]

Pending a decision on target frameworks for the project; the open proposal is to replace the Xamarin.iOS10 and uap10.0 targets with netstandard1.4, with hidden certificate authentication in order to conform to the limits of the Identity Model client for Azure Active Directory package used.