remove unused import
remove unused import

enzochiau/cliff,openstack/cliff,citrix-openstack-build/cliff,idjaw/cliff,hguemar/cliff-tablib,dreamhost/cliff-tablib,dtroyer/cliff,varunarya10/cliff,openstack/cliff,varunarya10/cliff,dtroyer/cliff,enzochiau/cliff,dhellmann/cliff-tablib,idjaw/cliff,citrix-openstack-build/cliff