update keystone.conf.sample for ocata-rc
update keystone.conf.sample for ocata-rc

Change-Id: Ic184d77df10bb0c335efddd92a1d35402c4bb7be

ilay09/keystone,openstack/keystone,ilay09/keystone,rajalokan/keystone,ilay09/keystone,rajalokan/keystone,mahak/keystone,openstack/keystone,mahak/keystone,rajalokan/keystone,openstack/keystone,mahak/keystone