Added openstackwatch to the list of entry_points in setup.py.

Change-Id: Ia72deaf0e5024f132094ffc2f485b0b359be3e7a
Reviewed-on: https://review.openstack.org/23555
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins