What about this:

2016-11-04 23:51:46.690 29720 INFO nova.wsgi [req-03b32a34-c385-418e-b765-f1a0fc97d6aa - - - - -] metadata listening on 0.0.0.0:8775
2016-11-04 23:51:46.692 29720 INFO oslo_service.service [req-03b32a34-c385-418e-b765-f1a0fc97d6aa - - - - -] Starting 8 workers
2016-11-04 23:51:46.772 29720 CRITICAL nova [req-03b32a34-c385-418e-b765-f1a0fc97d6aa - - - - -] ConfigFileValueError: Value for option url is not valid: invalid URI: 'http://openstack-controller:9696'
2016-11-04 23:51:46.772 29720 ERROR nova Traceback (most recent call last):
2016-11-04 23:51:46.772 29720 ERROR nova   File "/usr/bin/nova-api", line 10, in <module>
2016-11-04 23:51:46.772 29720 ERROR nova     sys.exit(main())
2016-11-04 23:51:46.772 29720 ERROR nova   File "/usr/lib/python2.7/dist-packages/nova/cmd/api.py", line 73, in main
2016-11-04 23:51:46.772 29720 ERROR nova     launcher.wait()
2016-11-04 23:51:46.772 29720 ERROR nova   File "/usr/lib/python2.7/dist-packages/oslo_service/service.py", line 568, in wait
2016-11-04 23:51:46.772 29720 ERROR nova     self.conf.log_opt_values(LOG, logging.DEBUG)
2016-11-04 23:51:46.772 29720 ERROR nova   File "/usr/lib/python2.7/dist-packages/oslo_config/cfg.py", line 2626, in log_opt_values
2016-11-04 23:51:46.772 29720 ERROR nova     _sanitize(opt, getattr(group_attr, opt_name)))
2016-11-04 23:51:46.772 29720 ERROR nova   File "/usr/lib/python2.7/dist-packages/oslo_config/cfg.py", line 3057, in __getattr__
2016-11-04 23:51:46.772 29720 ERROR nova     return self._conf._get(name, self._group)
2016-11-04 23:51:46.772 29720 ERROR nova   File "/usr/lib/python2.7/dist-packages/oslo_config/cfg.py", line 2668, in _get
2016-11-04 23:51:46.772 29720 ERROR nova     value = self._do_get(name, group, namespace)
2016-11-04 23:51:46.772 29720 ERROR nova   File "/usr/lib/python2.7/dist-packages/oslo_config/cfg.py", line 2711, in _do_get
2016-11-04 23:51:46.772 29720 ERROR nova     % (opt.name, str(ve)))
2016-11-04 23:51:46.772 29720 ERROR nova ConfigFileValueError: Value for option url is not valid: invalid URI: 'http://openstack-controller:9696'
2016-11-04 23:51:46.772 29720 ERROR nova
2016-11-04 23:51:47.019 29908 INFO nova.metadata.wsgi.server [req-552dbbd2-67a5-46ba-833a-bae7decb0574 - - - - -] (29908) wsgi starting up on http://0.0.0.0:8775
2016-11-04 23:51:47.164 29914 INFO nova.metadata.wsgi.server [req-e7d7e52d-233b-43a7-a873-8b0131056e86 - - - - -] (29914) wsgi starting up on http://0.0.0.0:8775
2016-11-04 23:51:47.164 29907 INFO nova.metadata.wsgi.server [req-8281b638-af19-4d56-92fc-c8e06b918d2e - - - - -] (29907) wsgi starting up on http://0.0.0.0:8775
2016-11-04 23:51:47.226 29909 INFO nova.metadata.wsgi.server [req-e21d65f8-ba57-4c0f-b400-10d5d1a84f6e - - - - -] (29909) wsgi starting up on http://0.0.0.0:8775
2016-11-04 23:51:47.233 29914 INFO oslo_service.service [-] Parent process has died unexpectedly, exiting
2016-11-04 23:51:47.233 29914 INFO nova.wsgi [-] Stopping WSGI server.
2016-11-04 23:51:47.233 29860 INFO oslo_service.service [-] Parent process has died unexpectedly, exiting
2016-11-04 23:51:47.234 29914 INFO nova.metadata.wsgi.server [req-e7d7e52d-233b-43a7-a873-8b0131056e86 - - - - -] (29914) wsgi exited, is_accepting=True
2016-11-04 23:51:47.234 29860 INFO nova.wsgi [-] Stopping WSGI server.
2016-11-04 23:51:47.235 29914 INFO nova.wsgi [-] Stopping WSGI server.
2016-11-04 23:51:47.234 29857 INFO oslo_service.service [-] Parent process has died unexpectedly, exiting
2016-11-04 23:51:47.235 29860 INFO nova.osapi_compute.wsgi.server [req-5784d238-bfd7-467f-a8c8-9196a42608ca - - - - -] (29860) wsgi exited, is_accepting=True
2016-11-04 23:51:47.235 29914 INFO nova.wsgi [req-03b32a34-c385-418e-b765-f1a0fc97d6aa - - - - -] WSGI server has stopped.
2016-11-04 23:51:47.235 29856 INFO oslo_service.service [-] Parent process has died unexpectedly, exiting
2016-11-04 23:51:47.235 29857 INFO nova.wsgi [-] Stopping WSGI server.