This change adds cinder API application, so cinder API can be run
under wsgi server(Apache, Nginx, etc). Eventlet will still be used
by default.
Cinder API with eventlet as a webserver and wsgi application
managing has some cons:
* Cinder API is deployed in other way as a common web application.
Apache/Nginx is generally used web servers for REST API application.
* Cinder API is run as a separate service. It means that cloud
operators need to configure some software to monitor that the API
is running.
* Apache/Nginx works better under the real heavy load than eventlet.
To use c-api deployment under Apache in devstack assign
devstack var CINDER_USE_MOD_WSGI="True".
Related changes in devstack:
https://review.openstack.org/#/c/204643/
Cinder documentation on how deploy cinder API under Apache:
https://review.openstack.org/#/c/207020/
Patch for Infra to make it tested:
https://review.openstack.org/#/c/208498/
DocImpact
Implements: blueprint: non-eventlet-wsgi-app
Change-Id: If877d700b0efaa5406efa8f8f17c5816928e83ce
91a8e88dc6