New dependency oslo.context broke nailgun

[Tatyanka]

Assassind failed to start with:
Traceback (most recent call last):
  File "/usr/bin/assassind", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 2957, in <module>
    working_set.require(__requires__)
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 695, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 594, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: oslo.context>=0.2.0,<0.3.0

VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "7.0"
  openstack_version: "2015.1.0-7.0"
  api: "1.0"
  build_number: "133"
  build_id: "2015-08-04_15-47-06"
  nailgun_sha: "08509c2601205db161469b62134369ccd68bea57"
  python-fuelclient_sha: "5d69610b94a21ec50f8e3a3bbf5608cbab895842"
  fuel-agent_sha: "1fe47720ba554818a0be707f2e16281791492d50"
  fuel-nailgun-agent_sha: "1512b9af6b41cc95c4d891c593aeebe0faca5a63"
  astute_sha: "e1d3a435e5df5b40cbfb1a3acf80b4176d15a2dc"
  fuel-library_sha: "8fee8a37f7ec1f8b975ec819ea6f062c1d66ec93"
  fuel-ostf_sha: "a15b0aec5e5ff4f54a7834d54ff920e5aa546f29"
  fuelmain_sha: "7a374fbd1f5ebde943cb391a4f71b94888ce4a15"

Caused by review:
https://github.com/stackforge/fuel-web/commit/a3d6792f4c2b1a9a52168d9524b6bd2aa4a27c9b

[Sebastian Kalinowski (prmtl)]

Fix for the problem is in this review: https://review.openstack.org/#/c/208947/
It is a follow up of https://github.com/stackforge/fuel-web/commit/a3d6792f4c2b1a9a52168d9524b6bd2aa4a27c9b

[Vasyl Saienko (vsaienko)]

Do we have system tests for fuel-web? How it is possible that commit [1] breakes deployment?

[1] https://review.openstack.org/#/c/208916/

[Sebastian Kalinowski (prmtl)]

Vasyl, requirements break because of what releases are done by package maintainer - what was working on time of merging and for few hours after this . Additionally this was a quick-fix to unblock CI and the comprehensive fix was not merged until today.

[Sebastian Kalinowski (prmtl)]

Additionally we do not control what and how packages in our Cantos mirros are tested against our Fuel components - if there is a package that breaks requirements on installed master node we cannot detect it. It's up to build team.

https://review.openstack.org/#/c/208947/ is merged, nailgun requirements in master are in good shape, issues from this bug are caused by packages requirements from spec file.

[Dmitry Borodaenko (angdraug)]

FYI no, fuel-web is not currently covered by system tests, so please do be careful with requirements changes.