make rbtools work with 1.5.1 with HTTP basic auth
Review Request #2228 — Created April 1, 2011 and discarded
Make rbtools postreview work with 1.5.1 with HTTP basic auth.
The changes to make this work:
* Allow auth retries when the URL has changed
* Allow HTTP 401 to occur when getting root /api
Tested against local review board instance.