Do not show subordinate services in the mv unplaced unit token list
Added test to make sure we don't render subordinate units as unplaced
Merge pull request #554 from hatched/sub-unplaced-1369576

Do not show subordinate services in the mv unplaced unit token list

This is a temporary fix to not instantiate or render subordinate services as unplaced units in the machine view. A real fix will involve having the service charm data fetch updating the unit information and having juju send the unit subordinate status in the delta.