[bwcompat] set response headers on AuthenticationError (closes #12219860)
Turns out sending a response without a Content-Type header (among
others) is suboptimal. 5b36399b6b21 was not good enough.
David Douard <david.douard@logilab.fr> [Tue, 22 Mar 2016 14:01:44 +0100] rev 11611
[tests] add a __main__ handler
the relative import in test_rest_api.py needs to be modified to prevent a
ValueError: Attempted relative import in non-package