make gevent.http 2.4-compatible

- and don't silent KeyboardInterrupt in serve_forever()

gevent/http.py

@@ -68,6 +68,7 @@ class HTTPServer(object):
             if self._done_event is None:
                 self._done_event = Event()
             t = Timeout.start_new(timeout)
+            try:
                 try:
                     self._done_event.wait(timeout=timeout)
                 except Timeout, ex:
@@ -141,8 +142,6 @@ class HTTPServer(object):
             if self._serve_forever_event is None:
                 self._serve_forever_event = Event()
             self._serve_forever_event.wait()
-        except KeyboardInterrupt:
-            pass
         finally:
             Greenlet.spawn(self.stop, timeout=stop_timeout).join()