gluster: Show host name also on action on services

Earlier the event log message shown in case of start/stop/restart of
services was shown in the format "SWIFT services started on cluster
<clustername>."

Corrected the same to show host name as well in the form "SWIFT services
started on <hostname> on cluster <clustername>".

Change-Id: Ic840e8e20a28e31ba79ee17eabf201fe3941ce7d
Bug-Url: https://bugzilla.redhat.com/973528
Signed-off-by: Shubhendu Tripathi <shtripat@redhat.com>