Updated openstack/openstack
Project: openstack/ceilometer  25274cbf0d8390558e7b22c2ae6c0584b2d90fdc

Doc enhancement for API service deployment with mod_wsgi

Now Pecan is sharing the same debug configration with Ceilometer,
but DebugMiddleware of Pecan doesn't support multi processes.
That means user can't enable the Ceilometer debug mode if he is
using multi process mode for mod_wsgi config.

Closes-Bug: 1352088

Change-Id: I6e83fbcbee23a519fe26c3036f42cc619848a989