Add --kill option to mitmdump

If this option is passed all requests that are not part of a replayed
conversation are killed. If the option is not passed, such requests are passed
through to the server as usual.

mitmdump

@@ -50,6 +50,9 @@ if __name__ == '__main__':
     parser.add_option("-r", "--replay",
                       action="store", dest="replay", default=None,
                       help="Replay server responses from a saved file.")
+    parser.add_option("-k", "--kill",
+                      action="store_true", dest="kill", default=False,
+                      help="Kill extra requests during replay.")
 
     options, args = parser.parse_args()
 
@@ -65,6 +68,7 @@ if __name__ == '__main__':
         request_script = options.request_script,
         response_script = options.response_script,
         replay = options.replay,
+        kill = options.kill
     )
     if args:
         filt = " ".join(args)