* Update AMS API Version to 2.17 + Fix integration tests

* Add AzureAD support (WIP)

* Update samples and unit test to use Azure AD Service Princial authentication

* Add User/Pass authentication + Access Token Cache

* Update README.md

* Fix typo

* Fix typo

* Remove old unit test + dead code

* Updated README document of Azure Media Services samples to include Azure AD authentication scenarios

* Fix MediaServicesSettings unit tests

* Remove group annotation

* Fix AuthenticationFilter unit tests