gluster: Show the notification if host added from CLI

The notification for import/detach in Cluster general tab was not being
displayed if hosts added from CLI. Fixed the same.

Change-Id: Ibc6d586c1c82b0c415a4e898c77b1cedc89e7970
Signed-off-by: Shubhendu Tripathi <shtripat@redhat.com>