Add tests when admin set alarm owner to its own

This patch add some tests to cover the case of a admin set
the alarm owner of a combination alarm to its own project-id/user-id
to verify that the admin is not scoped on its project-id.

Change-Id: Id0a8bafc21e91c655db02564335eb1865004c695
Merge "Add tests when admin set alarm owner to its own"