SF bug [#410708] Condition.wait() and KeyboardInterrupt.

http://sourceforge.net/tracker/?func=detail&aid=410708&group_id=5470&atid=105470
Added try/finally around Condition.wait() guts, so that the lock state gets
restored at the end no matter what happens.

Lib/threading.py

@@ -185,6 +185,7 @@ class _Condition(_Verbose):
         waiter.acquire()
         self.__waiters.append(waiter)
         saved_state = self._release_save()
+        try:    # restore state no matter what (e.g., KeyboardInterrupt)
             if timeout is None:
                 waiter.acquire()
                 if __debug__:
@@ -209,6 +210,7 @@ class _Condition(_Verbose):
                 else:
                     if __debug__:
                         self._note("%s.wait(%s): got it", self, timeout)
+        finally:
             self._acquire_restore(saved_state)
 
     def notify(self, n=1):