If a node does not contain IP or port, consider its children.

Make the shutdown flag on servers be per thread to save contention on
the lock that must guard it.

showing up as memory leaks

Also reduce the rate of the openloop test - this may be an issue with
sanitizers particularly because of issue #2278

Handle the case where we recreate an auth context.

Add (opt-in) debugging for refcounts on auth contexts.

- Allow ablity to specify the length for decoding.
- Allow for non-padded encodings to be decoded properly.

Clean up anything that failed

- uri parsing
- dns resolution

Assertation could be false if the server responds quickly enough (it's
unlikely to). Removing the assert does not change the nature of the
test.