Updated openstack/openstack
Project: openstack/keystone  f6c9002fc2d98a1d5eead4d074893dae58d38220
null
Correct a docstring in keystone.common.config

Correct the docstring for keystone.common.config.list_opts to have
better grammar and make sense.

Change-Id: I4861e1ab111d89363267607aa411a5326279f0af