verify-fuel-web-docs fails with random errors

[Tatyanka]

There different problem with handling dependencies,
some of job fails with
File "/home/jenkins/workspace/verify-fuel-web-docs_VENV/local/lib/python2.7/site-packages/sphinx/application.py", line 21, in <module>

    from docutils import nodes

ImportError: No module named docutils

error in setup command: Error parsing /home/jenkins/workspace/verify-fuel-web-docs_VENV/build/positional/setup.cfg: ImportError: No module named docutils

https://ci.fuel-infra.org/job/verify-fuel-web-docs/13443/console

[Aliaksei Cherniakou (acherniakou)]

This happens due to new version of pbr 1.9.0 (pbr>=1.6 (from oslo.serialization>=1.4.0->-r requirements.txt (line 16)))
Everything is fine with pbr==1.8.1 https://ci.fuel-infra.org/job/verify-fuel-web-docs/13448/consoleFull
I'm going to have a closer look at the issue to identify a root cause.

[Tatyanka (tatyana-leontovich)]

the same from my side: with downgrade pbr version works fine

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: master
Change author: Aliaksei Cherniakou <email address hidden>
Review: https://review.fuel-infra.org/19528

[Aliaksei Cherniakou (acherniakou)]

new version of pip works fine for this case, so it was decided to upgrade it before installing dependencies
https://ci.fuel-infra.org/job/verify-fuel-web-docs/13451/console

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/19528
Submitter: Dmitry Kaigarodsev <email address hidden>
Branch: master

Commit: ac75cbadcede51ba6c4c0d8157b2a604d22f47c8
Author: Aliaksei Cherniakou <email address hidden>
Date: Tue Apr 12 20:14:18 2016

Upgrade pip to avoid dependency handling issues

Change-Id: I6c3b0163040f03bca0206fc139169e323bd761b3
Closes-Bug: #1569514