Updated openstack/openstack
Project: openstack/neutron  97374243752605cff1ae1a2a52a99b6c2d670c4f

Remove two sets that are not referenced

The code no longer references the updated_routers and removed_routers
sets.  This should have been cleaned up before but was missed.

Change-Id: I0396e13d2f7c3789928e0c6a4c0a071b02d5ff17