commands: add 'openstack' to the list of clients
commands: add 'openstack' to the list of clients

Change-Id: Id0dc99c4e3a0c6713fd93be364900074637b08e0

savinash47/openstack-doc-tools,openstack/openstack-doc-tools,openstack/openstack-doc-tools,savinash47/openstack-doc-tools,savinash47/openstack-doc-tools