Requirement for pbr in fuel-upgrade inconsistent with Fuel requirements

[Oleg S. Gelbukh]

With 'pbr>=1.8' requirement, fuel-upgrade package cannot be installed on the Fuel Admin node due to the conflict:

  pkg_resources.VersionConflict: (pbr 0.8.0 (/usr/lib/python2.6/site-packages), Requirement.parse('pbr>=1.8'))

Additionally, setuptools cannot work with '-r requirements.txt' in test-requirements.txt file.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/260939

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/260939
Committed: https://git.openstack.org/cgit/openstack/fuel-upgrade/commit/?id=3c5f5b6f877c0f5d7fb6e58c6e9684458ffcfc5c
Submitter: Jenkins
Branch: master

commit 3c5f5b6f877c0f5d7fb6e58c6e9684458ffcfc5c
Author: Oleg Gelbukh <email address hidden>
Date: Wed Dec 23 10:20:02 2015 +0000

    Remove inconsistent requirements

    Requirement to pbr>=1.18 is inconsistent with other Fuel components.
    Remove restrictions from pbr version.
    Remove '-r requirements.txt' from test-requirements.

    Change-Id: I02b849f6f8cc29dbe3f50e02c588b20a419fb772
    Closes-bug: 1528816