Remove events that are not part of 2.7.1

src/yang/etsi-nfv-common.yang

@@ -289,12 +289,6 @@ submodule etsi-nfv-common {
       enum "end-vnf-ext-conn-change";
       enum "start-vnfinfo-modification";
       enum "end-vnfinfo-modification";
-      enum "start-vnf-snapshot-creation";
-      enum "end-vnf-snapshot-creation";
-      enum "start-vnf-snapshot-reverting-to";
-      enum "end-vnf-snapshot-reverting-to";
-      enum "start-change-current-vnf-package";
-      enum "end-change-current-vnf-package";
     }
   }
 
@@ -308,9 +302,6 @@ submodule etsi-nfv-common {
       enum "vnf-operation-change";
       enum "vnf-ext-conn-change";
       enum "vnfinfo-modification";
-      enum "vnf-snapshot-creation";
-      enum "vnf-snapshot-reverting-to";
-      enum "change-current-vnf-package";
     }
   }