Keystone fails to start in devtest check run - "Address already in use"

[Mark McLoughlin]

See http://logs.openstack.org/83/73583/2/check/check-tempest-dsvm-full/4009b24/logs/screen-key.txt.gz

 2014-02-17 11:07:32.608 22842 ERROR root [-] Failed to start the admin server
 2014-02-17 11:07:32.608 22842 TRACE root Traceback (most recent call last):
 2014-02-17 11:07:32.608 22842 TRACE root File "/opt/stack/new/keystone/bin/keystone-all", line 78, in serve
 2014-02-17 11:07:32.608 22842 TRACE root server.start()
 2014-02-17 11:07:32.608 22842 TRACE root File "/opt/stack/new/keystone/keystone/common/environment/eventlet_server.py", line 65, in start
 2014-02-17 11:07:32.608 22842 TRACE root backlog=backlog)
 2014-02-17 11:07:32.608 22842 TRACE root File "/usr/local/lib/python2.7/dist-packages/eventlet/convenience.py", line 38, in listen
 2014-02-17 11:07:32.608 22842 TRACE root sock.bind(addr)
 2014-02-17 11:07:32.608 22842 TRACE root File "/usr/lib/python2.7/socket.py", line 224, in meth
 2014-02-17 11:07:32.608 22842 TRACE root return getattr(self._sock,name)(*args)
 2014-02-17 11:07:32.608 22842 TRACE root error: [Errno 98] Address already in use