unit test failures due to new release of Routes package (v2.3)

[Aditya Vaja]

Hi,

I'm seeing unit test failures when I test locally after a fresh git clone of neutron master. Most recent commit in git log: commit f337a20a2fe7f9cb785d2e78856c1396bc087e65

$ ./run_tests.sh -V -f

log excerpt: http://paste.openstack.org/show/492384/

I update the requirements.txt to use 'Routes<2.0,>=1.12.3' and all the tests work fine.
I see there was a new release (v2.3 ) of Routes on 28th March 2016 [1], which seems to have caused the issue, specifically:
 - Concatenation fix when using submappers with path prefixes. Multiple submappers combined the path prefix inside the controller argument in non-obvious ways. The controller argument will now be properly carried through when using submappers. PR #28[2].

Should I submit this requirements.txt change as a patch or should we pass the required two args as the patch? I can do the requirement.txt change. For the latter, somebody who knows what goes on in the extensions.py __init__() should take a look.

I assume this will also affect the stable branches, since the Routes package versin in requirements.txt in previous versions was same as in master.

--
Aditya

[1] https://routes.readthedocs.org/en/latest/changes.html#release-2-3-march-28-2016
[2] https://github.com/bbangert/routes/pull/28/files?diff=unified#diff-b54de741c3f86d76eb4bce4a223054aaL154