o Minor bugfixes:
    - Always believe that v3 directory authorities serve extra-info
      documents, regardless of whether their server descriptor contains a
      "caches-extra-info" line or not. Fixes part of #11683. Bugfix on
      0.2.0.1-alpha.
    - When running as a v3 directory authority, advertise that you serve
      extra-info documents so that clients who want them can find them from
      you too. Fixes part of bug #11683. Bugfix on 0.2.0.1-alpha.