if showsid doesn't work, just return true

The regular service.py returns true if it can't get the pid.
We'll do the same here if we can't get the sid
Just return True or False

Skip trying to return the pid. Not necessary
Merge pull request #6952 from UtahDave/update_win_service

if showsid doesn't work, just return true
Change runner cache.py to use MasterPillarUtil minion targeting
Change function descriptions for cache.py grains() and pillar()