return default introducer web.port to none

No web ui for introducers has been the default behavior for a long time, so
lets leave it that way now even though create-introducer can configure a
web.port now. This also makes the one test that was failing pass.
Merge branch 'meskio' into truckee
fix test_util.TimeFormat.format_delta
Merge branch '1973-status-last-rx' into truckee