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* openstack-origin is no longer required when using openstack-origin-git. * Drop kilo from openstack-origin-git default values because upper constraints doesn't work in kilo for openstack-dashboard and glance. * Add flag to allow for disabling upper constraints when using openstack-origin-git with user-specified git repositories. Change-Id: I017dfd20e3fe997558c13d15c7d05dd1692e7730