[master-pkg-systest-centos] Fails on .spec file update from upstream for python-cryptography package

[Ivan Udovichenko]

In cases when we use Obsoletes:/Provides: types of dependency in .spec file for python2-cryptography package. [1]
fuel-qa script fails during packages update. [2]

Using Obsoletes:/Provides: types of dependency is perfectly fine and should not lead to such errors.

[1] https://review.fuel-infra.org/#/c/22949/5/python-cryptography.spec #61,#66
[2] https://packaging-ci.infra.mirantis.net/job/master-pkg-systest-centos/1003/console

[Igor Yozhikov (iyozhikov)]

Suggestion:
When fuel-qa running yum update: script could count amount of changed packages.
4 example catching strings which are starting from "Installing" or "Erasing".

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/339159

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/339159
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=62f3da00cb3ff15417697cef121c88275a583c3e
Submitter: Jenkins
Branch: master

commit 62f3da00cb3ff15417697cef121c88275a583c3e
Author: Artem Panchenko <email address hidden>
Date: Thu Jul 7 20:40:38 2016 +0300

    Fix "variable referenced before assignment" error

    It's possible to get the error above if no packages
    were updated on master node in 'admin_install_updates'
    method.

    Also tests must handle situations when old package is
    replaced by new one, so it's marked as installed but
    not upgraded.

    Change-Id: I6fe99ae16d887024643c60ea60e7650181fd432a
    Closes-bug: #1599901