expunge vm: Allow expunging a VM in destroyed state (#5183)

Author: Pearl1594

server/src/main/java/com/cloud/vm/UserVmManagerImpl.java

@@ -3011,7 +3011,7 @@ public UserVm destroyVm(DestroyVMCmd cmd) throws ResourceUnavailableException, C
             throw new InvalidParameterValueException("unable to find a virtual machine with id " + vmId);
         }
 
-        if (vm.getState() == State.Destroyed || vm.getState() == State.Expunging) {
+        if ((vm.getState() == State.Destroyed && !expunge) || vm.getState() == State.Expunging) {
             s_logger.debug("Vm id=" + vmId + " is already destroyed");
             return vm;
         }