hba: Run fc-scan in supervdsm

On master zombiereaper is available in supervdsm, so we can run fc-scan
from suprevdsm instead of using sudo.

Change-Id: If78a464d7d14ce0d0fcf218c7f897d5b810185e4
Signed-off-by: Nir Soffer <nsoffer@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/35587
Reviewed-by: Adam Litke <alitke@redhat.com>
Reviewed-by: Federico Simoncelli <fsimonce@redhat.com>