adds missing import and removes empty docstring
adds missing import and removes empty docstring

fixes bug 1014788
fixes bug 1015210

Change-Id: Id5dd44d5d0265368e39b36ef1d4f6694aedb6456

akash1808/glance,wkoathp/glance,paramite/glance,ntt-sic/glance,paramite/glance,stevelle/glance,citrix-openstack-build/glance,wkoathp/glance,stevelle/glance,kfwang/Glance-OVA-OVF,cloudbau/glance,scripnichenko/glance,klmitch/glance,klmitch/glance,tanglei528/glance,rickerc/glance_audit,redhat-openstack/glance,openstack/glance,JioCloud/glance,jumpstarter-io/glance,redhat-openstack/glance,sigmavirus24/glance,sigmavirus24/glance,jumpstarter-io/glance,ozamiatin/glance,tanglei528/glance,SUSE-Cloud/glance,dims/glance,SUSE-Cloud/glance,darren-wang/gl,scripnichenko/glance,openstack/glance,citrix-openstack-build/glance,vuntz/glance,takeshineshiro/glance,vuntz/glance,dims/glance,ozamiatin/glance,openstack/glance,darren-wang/gl,ntt-sic/glance,akash1808/glance,JioCloud/glance,rajalokan/glance,takeshineshiro/glance,saeki-masaki/glance,saeki-masaki/glance,cloudbau/glance,rajalokan/glance,kfwang/Glance-OVA-OVF,rickerc/glance_audit