packaging: setup: start vdsmd only if not running

in LATE_SETUP stage start vdsmd only if it is not
already running, avoiding errors due to
'cannot start VDS daemon when another instance runs'

Bug-Url: https://bugzilla.redhat.com/999542
Change-Id: Ic12fec8ef572ba9ad0bc5b3773fa8e1e1d16c4fc
Reported-By: Leonid Natapov <lnatapov@redhat.com>
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>