Comment 1 for bug 1660878

Looks like it's more than just that test:

http://logs.openstack.org/48/426448/2/gate/gate-tempest-dsvm-neutron-full-ubuntu-xenial/ecb3d0a/console.html#_2017-01-31_14_47_05_827109

Details: {u'code': 409, u'message': u"Cannot 'rebuild' instance b7279ba1-1847-4942-912c-d1f148f00ca3 while it is in vm_state building"}