irclib: catch exception when calling callback.reset()

We don't want the Irc driver to hang when a plugin crashes
in this function.

src/irclib.py

@@ -1208,7 +1208,10 @@ class Irc(IrcCommandDispatcher, log.Firewalled):
         self.fastqueue.reset()
         self.startedSync.clear()
         for callback in self.callbacks:
+            try:
                 callback.reset()
+            except Exception:
+                log.exception('Uncaught exception in %r.reset()', callback)
         self._queueConnectMessages()
 
     def _setNonResettingVariables(self):