o Minor feature (hidden services):
    - Log a message when a hidden service reaches its introduction point
      circuit limit, and when that limit is reset.
      Follow up to ticket 21594, closes ticket 21622.
    - Add more information to the message logged when a hidden service
      descriptor has fewer introduction points than specified in
      HiddenServiceNumIntroductionPoints.
      Follow up to tickets 21598 and 21599, closes ticket 21622.