Remove the following from our sync'ed oslo incubator section:
Since we are now using oslo.config.
Also remove the following:
Since only config/generator was using it.
Also, tweaking keystone/i18n.py since it made reference to
Removing the no longer sync'ed parts from openstack-common.conf
Keystone was using the I18N functions from oslo-incubator. With
this change, Keystone uses the new oslo.i18n library.
The tests were adapted to not use internal symbols because these are
subject to change.