Add 'managehome => true' to create home directory for openstackwatch user.

Change-Id: Ie1a0ae161858dc42c96cf2444fb2c3c97faafe85
Reviewed-on: https://review.openstack.org/24602
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins