Update tacker CLI to openstack CLI in cleanup-tacker

Change to openstack CLI

Change-Id: I75db9548b94800b6a451a658931d11a333a8e054

contrib/demos/tacker/cleanup-tacker

 #!/bin/bash
 if [[ -f kolla-sample-vnffgd.yaml ]]; then
     echo "Deleting VNFFG"
-    tacker vnffg-delete kolla-sample-vnffg
+    openstack vnf graph delete kolla-sample-vnffg
     echo "Deleting VNFFGD"
-    tacker vnffgd-delete kolla-sample-vnffgd
+    openstack vnf graph descriptor delete kolla-sample-vnffgd
     echo "Deleting sample sfc instances"
     openstack server delete kolla_sfc_server kolla_sfc_client
 fi
 echo "Deleting sample VNF"
-tacker vnf-delete kolla-sample-vnf
-while tacker vnf-list | grep -q kolla-sample-vnf; do
+openstack vnf delete kolla-sample-vnf
+while openstack vnf list | grep -q kolla-sample-vnf; do
     sleep 1
 done
 echo "Deleting sample VNFD"
-tacker vnfd-delete kolla-sample-vnfd
+openstack vnf descriptor delete kolla-sample-vnfd
 echo "Deleting sample VIM"
-tacker vim-delete kolla-sample-vim
+openstack vim delete kolla-sample-vim
 echo "Removing sample config"
 rm -rf ./kolla-sample-*