Add keystonemiddleware to oslo-config-generator conf
Add keystonemiddleware to oslo-config-generator conf

This is needed to get the [keystone_authtoken] section into
monasca-api.conf when generating the sample config file with "tox
-egenconfig".

Change-Id: I6d3670c8fec11cd9a3e72412e30daa800d4942af

stackforge/monasca-api,stackforge/monasca-api,openstack/monasca-api,openstack/monasca-api,stackforge/monasca-api,openstack/monasca-api,stackforge/monasca-api