rgmanager: Kill correct PIDs during force_unmount
    
    When stopping a service that contains a filesystem resource that is
    managed by fs.sh, on a stop operation it can kill a process that is
    not located on that mount point.
    
    There was a couple of scenarios that would kill a process that was
    not on that mount point when it was stopped:
    
    These processes should not have been killed:
     $ less /tmp/media/demo1/tmp.txt
     $ less /tmp/test\ /media/demo1/tmp.txt
    
    These processes was and should have been killed:
     $ less /media/demo1/tmp.txt
    
    Resolves: rhbz#555901
    
    Signed-off-by: Lon Hohberger <lhh@redhat.com>