[trac698] add self._closed

add the missing member variable to the fake class (FakeModuleCCSession)

src/lib/python/isc/config/tests/unittest_fakesession.py

@@ -35,6 +35,7 @@ class FakeModuleCCSession:
         # the message_queue is empty when receive is called, throw
         # a SessionTimeout
         self._timeout = 0
+        self._closed = False
 
     def group_subscribe(self, group_name, instance_name = None):
         if not group_name in self.subscriptions:
@@ -95,6 +96,7 @@ class FakeModuleCCSession:
     def close(self):
         # need to pass along somehow that this function has been called,
         self._socket = "closed"
+        self._closed = True
 
     def set_timeout(self, timeout):
         self._timeout = timeout