Add ability to run OpenStack `nova` APIs by Apache/Nginx

1) This would allow all the API services to be run within Apache/nginx, which means we could rely on Apache/nginx to multiplex the WSGI services properly, and route concurrent incoming HTTP requests in a well-performing manner.
2) This would allow use of 80/443 standard ports for all HTTP front-end surfaces, and remove some of the funkiness around all the OpenStack service-specific ports (8773, 8774, 8775, 9191, 9292, 5000, 37375, and the list goes on....). This would make the service catalog returned from Keystone cleaner.
3) This would be the first step towards removing the use of eventlet from the upstream WSGI/HTTP service endpoints. eventlet has, frankly, been a pain in the side of upstream development ever since it replace the (also pain in the side) Twisted framework, which replaced the (even more pain in the side) Tornado framework in Nova. non-eventlet endpoints are MUCH easier to debug and reason about.