This commit switches to using the oslo.config sphinx extension to
generate a sample config instead of doing it manually in the docs'
conf.py module.
Change-Id: I7032cb4f56c728911ffa5c6911eb504f53bc80af
Since including the sample configuration in tree is
becoming difficult to maintain, lets try moving it to
the developer docs. We still have the ability to view it
easily for users, and it can be auto-generated on doc build,
so it should also always be up to date.
Change-Id: I7ec2d76448feef5ecb9af7c238bbd12619fa31d8