gluster-nagios-monitoring : Fix for ui-plugin failure

This patch fixes the issue of removal of plugin from
service whenever the tab switches automatically by
itself when a selection is made from system tree.

Change-Id: Id64e7f4cbe326e62375500cc4cf169a75473b056
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1110799
Signed-off-by: Anmol Babu <anbabu@redhat.com>