Update tag value for vm state.

ccnode/hypervisor/domains/__init__.py

@@ -63,8 +63,7 @@ class VirtualMachine(object):
     @state.setter
     def state(self, value):
         self._state = value
-        # TODO tag announcement
-        self.tags['status'].value = value
+        self.tags['status'].update_value()
 
     @property
     def lv_dom(self):