Tenants API Client - Service Tests Parity

  1. Added service creation functionality to tenants-api client/test.
  2. Added service deletion functionality to tenants-api client/test.
  3. Refactored tenant_client_test.
  4. Rebased changes and uploaded a new patch set - fixed a merge faillure.

Change-Id: Ic3245af7a9bcfb73a78dfbd68ee16edb3f91d3c1
Merge "Tenants API Client - Service Tests Parity"