No module named fixtures on CI envs

[Kairat Kushaev]

Currently, gates are blocked because this patch has been merged to fuel-qa code recently:
https://review.openstack.org/#/c/358633/.
See failed build here:
https://product-ci.infra.mirantis.net/view/10.0/job/10.0.main.ubuntu.bvt_2/581/

We discussed this patch with Fuel-QA team and it was recommended to update virtualenv on all CI.
Here is requirements from Fuel-QA:
pytest==3.0.0
pytest-django==2.9.1

[Dmitry Kaigarodеsev (dkaiharodsev)]

fuel-qa team, please update related 'requirements.txt' file by mentioned dependencies

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/359022

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/359022
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=4ee508ef8bfd0fb46906d4b601ee0d0c62204235
Submitter: Jenkins
Branch: master

commit 4ee508ef8bfd0fb46906d4b601ee0d0c62204235
Author: Vladimir Khlyunev <email address hidden>
Date: Tue Aug 23 11:13:41 2016 +0300

    Bump pytest version to 3.0.0

    Since FixtureManager was moved from _pytest.python
    to _pytest.fixtures and fuel-qa's code was updated with this change
    we should bump minimal vertion of pytest

    Change-Id: I6d8a29d0410704e784212bcfead5ee8d5a5009a6
    Partial-bug:1615962

[Aleksandra Fedorova (bookwar)]

Fixed on Packaging CI and Product CI

[Dmitry Kaigarodеsev (dkaiharodsev)]

Fixed on fuel-ci slaves

[Roman Vyalov (r0mikiam)]

ETA: 23AUG

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/359204

[Vladimir Sharshov (vsharshov)]

Still actual:

https://ci.fuel-infra.org/job/master.fuel-web.pkgs.ubuntu.review_fuel_web_deploy/3887/console It failed with error
```Traceback (most recent call last):
  File "run_system_test.py", line 225, in <module>
    shell()
  File "run_system_test.py", line 221, in shell
    COMMAND_MAP[args.command](**vars(args))
  File "run_system_test.py", line 144, in run
    if group_in_pytest(g):
  File "run_system_test.py", line 64, in group_in_pytest
    from _pytest.python import FixtureManager
ImportError: cannot import name FixtureManager
```
Same problem in Astute jobs https://ci.fuel-infra.org/job/master.fuel-astute.pkgs.ubuntu.review_astute_patched/664/console

[Dmitry Kaigarodеsev (dkaiharodsev)]

issue solved by updating up to latest deployment environment (ISO, fuel-qa)
https://ci.fuel-infra.org/job/master.fuel-web.pkgs.ubuntu.review_fuel_web_deploy/3896/console

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/359204
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=ea443c3cc2d9cabf0bccd10d66538c01665cf40d
Submitter: Jenkins
Branch: master

commit ea443c3cc2d9cabf0bccd10d66538c01665cf40d
Author: Alexey Stepanov <email address hidden>
Date: Tue Aug 23 16:42:35 2016 +0300

    Drop private API usage in pytest groups grab

    use hook pytest_collection_finish
    Related-bug: #1615962

    Change-Id: I3a2cb1276a7621bf59b464930e280f5bc4786f1a

[Aleksei Stepanov (penguinolog)]

This module is not required now.