Get test_logging to not hang when running under regrtest.py -R ::

Not sure why/how _handlers/_handlerList is out of sync.  This could
indicate a deeper problem.

In test_logging, the only absolutely necessary change to get working
was tcpserver.abort = 1.  But we don't want to wait infinitely
to join the threads, so give a 2.0 second timeout.

There doesn't appear to be a need for a local abort variable
in serve_until_stopped, so just use the instance member.

Note the problem is only on HEAD, not in 2.4.

Lib/logging/__init__.py

@@ -671,7 +671,8 @@ class Handler(Filterer):
         #get the module data lock, as we're updating a shared structure.
         _acquireLock()
         try:    #unlikely to raise an exception, but you never know...
-            del _handlers[self]
+            if _handlers.has_key(self):
+                del _handlers[self]
             _handlerList.remove(self)
         finally:
             _releaseLock()