o Minor bugfixes (circuit, hidden service)
    - When closing a circuit, the reason for doing so was assigned from a int
      value to a uint16_t which is quite a problem for negative value that are
      our internal reasons (ex: END_CIRC_REASON_IP_NOW_REDUNDANT). On the HS
      side, this was causing introduction point to be flagged as unusable
      because the reason wasn't the right one due to the bad conversion.
      Partially fixes #21056 and fixes #20307; Bugfix on tor-0.2.8.1-alpha.