server: Honor vm.destroy.forcestop when expunge a vm (#3965)

When expunge a Running vm, vm will be stopped with forcestop=false which does not make sense. we should honor vm.destroy.forcestop in global setting, or always set forcestop=true.

engine/orchestration/src/main/java/com/cloud/vm/VirtualMachineManagerImpl.java

@@ -502,7 +502,7 @@ public class VirtualMachineManagerImpl extends ManagerBase implements VirtualMac
             return;
         }
 
-        advanceStop(vm.getUuid(), false);
+        advanceStop(vm.getUuid(), VmDestroyForcestop.value());
         vm = _vmDao.findByUuid(vm.getUuid());
 
         try {