gluster-nagios-monitoring: refactored trends-tab layout

Refactored the layout of the search panel of Trends tab.

Change-Id: I1064546318c7d65219461964dde174844ab41a55
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>
Signed-off-by: Anmol Babu <anbabu@redhat.com>