Create test helpers module

[waynew]

Should be pretty straightforward, Right now I think mock_with_name is the only thing that belongs in there.

         I'm OK with not blocking the PR on this - but let's go ahead and create that module and pull mock_with_name out into a common place

Originally posted by @waynew in https://github.com/saltstack/salt-ext-modules-vmware/pull/333#discussion_r1069786675