Updated openstack/openstack
Project: openstack/tempest  721f80d90dd470b4be3eeddfa45dce3a01a59d97

Remove use of 'cls.enabled = False'

Various network scenario tests have been setting this attribute
when raising skip exceptions.  It appears to no longer be used for
anything and can be removed.

Change-Id: I368f9e08cba6372010b9fed47f7730160e9d60b1