We have a couple of tests using the "assert_called_once" function, however, our salt-jenkins
states pin the version of mock at 1.0.1 (This is the last version that is compatible with
Python 2.6). We either need to use something else that works for all versions of mock or gate
the test.
In the pacman tests, it is possible to use "assert_called_with" instead of "assert_called_once"
In the dimension_data and gce unit tests, we need to gate the assertion behind a mock version check.
This way the tests won't fail if the version of mock installed is less than 2.0.0.
