Forcing dynamic credentials for identity admin

Identity tests work with credentials, so it is safer for them
to always use disposable credentials. Forcing dynamic creds
on regular identity tests would be however to restrictive, since it
would prevent any identity test from being executed against clouds
where admin credentials are not available.
Since All admin tests require admin credentials to be
executed, so this will not impact the ability to execute tests.

Change-Id: I0d7716e83d776d83eafe04dd71ac4888c0b71bc4
1 file changed