We just moved to using a hybrid approach that
uses the new oslo-config-generator for pulling out
library options to create the cinder.sample.conf file.
In that patch it was expected that we should use oslo_*
for the namespace. That, however, is not how
oslo-config-generator works.
This patch switches to using oslo.* for the namespace to get
the library options pulled in. This also fixes the fact that
we were putting multiple '[DEFAULT]' sections into the file.
Change-Id: Ie799d4d7e6deb2c486a93c5095fc3b766679fa95
Partial-bug: 1449235
ddf3800ad8