Add the missing column header to list-cached
Add the missing column header to list-cached

Fixes bug 901768

Change-Id: Ic313faba3587a2bfbc62bd81b6d6f5ad98a76ac5

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