Don't use Mock.called_once_with that does not exist

Don't use Mock.called_once_with that does not exist

class mock.Mock does not exist method called_once_with, it just exists
method assert_called_once_with. Currently there are still ome places
where we use called_once_with method, this patch let's correct it.

NOTE: called_once_with() does nothing because it's a mock object.

Closes-Bug: #1544522
Change-Id: Iac7c029a1cc66439f43d441bc6d0832686536961