tor/changes/ticket34067

  o Major features (relay self-testing, IPv6):
    - Relays now track their IPv6 ORPort separately from the reachability of
      their IPv4 ORPort.  They will not publish a descriptor unless _both_
      ports appear to be externally reachable. Closes ticket 34067.
Split "can reach ipv4 orport" from "can reach ipv6 orport". I've managed to keep this change mainly contained to our self-testing module. The changes here are: * There are two different variables for tracking "is our orport reachable". * We have a new function that says whether we can skip a single family's orport reachability test; the old function for this now tells whether we can skip _all_ orport reachability testing. (The name, router_should_skip_orport_reachability_test, is not so good. I will rename it later if I can think of a good replacement.) * The function that launches orport reachability tests now only launches the ones that haven't completed. * The function that notes that we're reachable on an ORPort now takes a family. * Various log messages are cleaned up. 2020-06-18 22:05:16 +02:00			`o Major features (relay self-testing, IPv6):`
			`- Relays now track their IPv6 ORPort separately from the reachability of`
			`their IPv4 ORPort. They will not publish a descriptor unless _both_`
			`ports appear to be externally reachable. Closes ticket 34067.`