Error with run_tests.sh: Invalid version of "six" installed

[Bob Ball]

run_tests.sh installs+upgrades the requirements from requirements.txt followed by doing the same for test-requirements.txt

test_requirements.txt does not have an upper bound on six and therefore upgrades it beyond the version permitted in requirements.txt.

tox installs+upgrades for both files at the same time rather than in serial, therefore identifies a version of six that satisfies all of the requirements.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/47114

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/47114
Committed: http://github.com/openstack/nova/commit/7134cb0d326c8544b9422477005e88976e84aa10
Submitter: Jenkins
Branch: master

commit 7134cb0d326c8544b9422477005e88976e84aa10
Author: Bob Ball <email address hidden>
Date: Wed Sep 18 10:30:31 2013 +0100

    Syncs install_venv_common.py from oslo-incubator

    Needed to make run_tests.sh identify requirements correctly

    We need to check requirements.txt and test-requirements.txt
    in parallel to ensure both are satisfied and we don't upgrade
    a package beyond requirements.txt's limits when installing
    dependencies for test-requirements.txt

    Fixes bug: 1227019

    Change-Id: I606f8a1d3eed5c270d5b3c154994d5c3a17b98c8