remove useless column in list_columns
remove useless column in list_columns

Bug #1209478

Change-Id: I2c231394bac9b30263f8ac87c1112eb6f1715808

vichoward/python-neutronclient,eayunstack/python-neutronclient,huntxu/python-neutronclient,vijayendrabvs/ssl-python-neutronclient,Juniper/python-neutronclient,johnpbatty/python-neutronclient,openstack/python-neutronclient,asadoughi/python-neutronclient,yamahata/python-tackerclient,cernops/python-neutronclient,roaet/python-neutronclient,mangelajo/python-neutronclient,varunarya10/python-neutronclient,venusource/python-neutronclient,varunarya10/python-neutronclient,rackerlabs/rackspace-python-neutronclient,openstack/python-neutronclient,vijayendrabvs/ssl-python-neutronclient,sajuptpm/python-neutronclient-ipam,NeCTAR-RC/python-neutronclient,JioCloud/python-neutronclient,huntxu/python-neutronclient,ntt-sic/python-neutronclient,johnpbatty/python-neutronclient,noironetworks/python-neutronclient,cryptickp/python-neutronclient,citrix-openstack-build/python-neutronclient,cernops/python-neutronclient,mangelajo/python-neutronclient,Stavitsky/python-neutronclient,rackerlabs/rackspace-python-neutronclient,roaet/python-neutronclient,JioCloud/python-neutronclient,venusource/python-neutronclient,citrix-openstack-build/python-neutronclient,vichoward/python-neutronclient,sajuptpm/python-neutronclient-ipam,Juniper/python-neutronclient,noironetworks/python-neutronclient,Stavitsky/python-neutronclient,ntt-sic/python-neutronclient,yamahata/python-tackerclient,eayunstack/python-neutronclient,cryptickp/python-neutronclient,asadoughi/python-neutronclient,NeCTAR-RC/python-neutronclient