During Pike cycle there was efforts to deploy services under
Apache HTTPD. It became clear very quickly that Glance did not
operate properly when deployed as bare wsgi app under web
server but admin documentation was merged that indicated that
being somehow the preferred method. It was added to the doc
that in Pike release there was issues in these models.
There was never interest nor resources to fix the underlying
issues but the doc stayed in place indicating that those
issues could be only Pike related when they in matter of
fact has got even worse over the time. Due to the fact that
Glance is even more relying on eventlet than back then it's
time to clarify the docs and make clear it's not adviced
deployment model, it won't work and there is no itention
to change that.
(cherry picked from commit