fuel-web wrong constraints in nailgun/requirements.txt

[Ivan Suzdal]

Detailed bug description:
It seems like CR [0] brought wrong constraints against of mitaka global requirements. In the upstream [1] python-requests is constrained with '>=2.8.1,!=2.9.0' condition, in the fuel-web it's '!=2.12.2,!=2.13.0,>=2.10.0'. Besides this change broke nailgun_syncdb [2] (mirantis repo has python-requests version 2.8.1).

[0] https://review.openstack.org/#/c/456832/
[1] https://github.com/openstack/requirements/blob/stable/mitaka/global-requirements.txt#L221
[2] http://paste.openstack.org/show/607660/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/459284

[OpenStack Infra (hudson-openstack)]

Change abandoned by Denis V. Meltsaykin (<email address hidden>) on branch: stable/mitaka
Review: https://review.openstack.org/459284
Reason: Abandoned in favor of: https://review.openstack.org/#/c/455731

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/455731
Committed: https://git.openstack.org/cgit/openstack/fuel-web/commit/?id=11430473db01af7647d8a2e71183c4d76590d475
Submitter: Jenkins
Branch: stable/mitaka

commit 11430473db01af7647d8a2e71183c4d76590d475
Author: Denis V. Meltsaykin <email address hidden>
Date: Tue Apr 11 17:27:23 2017 +0300

    Use upper constraints for mitaka

    This commit makes two changes:
            * make use of upper constraints for mitaka in tox to get rid
              of manully pinned requirements
            * get rid of the assert_called_once() call, which was never
              present in mock
            * get rid of the assert_called() call, which is not present
              in mock 1.3.0

    Closes-Bug: #1685783
    Change-Id: I9bb9c7c90ad8f3ddc14f1c6709376acc3b5e3395

[TatyanaGladysheva (tgladysheva)]

Verified on 9.2 + mu2 updates.

Latest BVT runs with fix are passed (since #1256 snapshot):
https://product-ci.infra.mirantis.net/job/9.x.main.ubuntu.bvt_2/1259/