tor/changes/bug13718-avoid-excluding-guards

  o Minor bugfixes (Test networks):
    - Avoid excluding guards from path building in minimal test networks,
      when we're in a test network, and excluding guards would exclude
      all nodes. This typically occurs in incredibly small tor networks,
      and those using TestingAuthVoteGuard *
      This fix only applies to minimal, testing tor networks,
      so it's no less secure.
      Fixes part of bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".