Added python-swiftclient package resource to openstackwatch.pp.

Change-Id: I7dbe8413467485b81dbcfe1e1a3952770e97bac6
Reviewed-on: https://review.openstack.org/24614
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins