Fix default service-type name in help
Fix default service-type name in help

Change-Id: I67483d31ffb71b6038aa41f79bdef17b50cd006e

citrix-openstack-build/python-saharaclient,citrix-openstack-build/python-saharaclient,citrix-openstack-build/python-saharaclient,openstack/python-saharaclient