add functional tests of the scrubber and delayed_delete
add functional tests of the scrubber and delayed_delete

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