Fixes bug #1189889
oslo.config-1.2.0 normalizes section names in config files to lowercase.
This means that simply by upgrading to oslo.config-1.2.0, users will now
be able to do e.g.
[default_servicetype]
description = ...
service_definition = ...
Change the default config files to make it clear we recommend the use of
lowercase section names.
Note, the use of an alpha tarball of oslo.config requires pbr>=0.5.15
but we already require >=0.5.16.
DocImpact
Change-Id: Ia47fb3d168da71d3221b25979f8c9257d70dd64d