Merge branch 'maint-0.3.5' into release-0.3.5

  o Minor bugfixes (connection):

    - Avoid reading data from closed connections, which can cause needless

      loops in libevent and infinite loops in Shadow. Fixes bug 30344; bugfix

      on 0.1.1.1-alpha.

  o Minor bugfixes (tls, logging):

    - Log TLS read buffer length bugs once, rather than filling the logs

      with similar warnings. Fixes bug 31939; bugfix on 0.3.0.4-rc.

  o Minor bugfixes (clietn, hidden service v3):

    - Fix a BUG() assertion that occurs within a very small race window between

      a client intro circuit opens and its descriptor that gets cleaned up from

      the cache. The circuit is now closed which will trigger a re-fetch of the

      descriptor and continue the HS connection. Fixes bug 28970; bugfix on

      0.3.2.1-alpha.

  o Major bugfixes (hidden service v3):

    - Make onion service always use the exact amount of configured intro points

      (or less due to node exlusion). Before, a service could sometimes pick

      more intro points than configured with the

      HiddenServiceNumIntroductionPoints option. Fixes bug 31548; bugfix on

      0.3.2.1-alpha.

  o Minor bugfixes (mainloop, periodic events):

    - Periodic events enabled flag was not unset properly when shutting down tor

      cleanly. This had the side effect to not re-enable periodic events when

      tor_api.h is used to relaunch tor after a shutdown. Fixes bug 32058;

      bugfix on 0.3.3.1-alpha.