webadmin: Hiding Confirm host reboot in Gluster mode

If the Application is running in 'GlusterOnly' mode,
'Confirm host rebooted' action will be hidden.

Change-Id: Ib2970eb5c5a88679f449633ba9ae7a342024e6a7
Bug-Url: https://bugzilla.redhat.com/879004
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>