This is 3.0.z bug, so correcting fixed_in.
setup was installed by packstack and GRE is working correctly openstack-packstack-2013.1.1-0.33.dev695.el6ost.noarch openstack-quantum-2013.1.4-3.el6ost.noarch
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2013-1510.html