gluster: Correct swift status display for UNKNOWN

If a host goes to non-responsive state because of vdsm down the status
of swift services was not shown properly.

Corrected the same to show the status of swift as unknown if the host is
non-responsive.

Change-Id: Ic1659425e94b562916162dcddc09a19ed60b2ccf
Bug-Url: https://bugzilla.redhat.com/975326
Signed-off-by: Shubhendu Tripathi <shtripat@redhat.com>