fix identity service comment
fix identity service comment

Change-Id: I8ce56a99dfbbc744a8a34e530af6bb234aaceeff

briancurtin/python-openstacksdk,stackforge/python-openstacksdk,mtougeron/python-openstacksdk,stackforge/python-openstacksdk,dtroyer/python-openstacksdk,dtroyer/python-openstacksdk,briancurtin/python-openstacksdk,mtougeron/python-openstacksdk,openstack/python-openstacksdk,openstack/python-openstacksdk,dudymas/python-openstacksdk,dudymas/python-openstacksdk