[system-tests] Upgrade tests failed due to incorrect UPGRADE_FUEL_* variables

[Vladimir Khlyunev]

Since we are working with new release we should modify default values in https://github.com/stackforge/fuel-qa/blob/cacdc3379c212326219dc5c0e878588b22eb8949/fuelweb_test/settings.py#L327-L328
UPGRADE_FUEL_FROM = os.environ.get('UPGRADE_FUEL_FROM', '6.1')
UPGRADE_FUEL_TO = os.environ.get('UPGRADE_FUEL_TO', '7.0')
(or modify existing job with overriding this variables in jenkins job)

Unchanged values leads to https://product-ci.infra.mirantis.net/job/8.0.system_test.ubuntu.upgrade_nova_cinder/7/console

 File "/home/jenkins/workspace/8.0.system_test.ubuntu.upgrade_nova_cinder/UPGRADE/fuelweb_test/helpers/checkers.py", line 230, in check_upgraded_containers
    'There are no {0} containers'.format(version_to))
AssertionError: There are no kilo containers

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/235764

[OpenStack Infra (hudson-openstack)]

Change abandoned by Vladimir Khlyunev (<email address hidden>) on branch: master
Review: https://review.openstack.org/235764
Reason: https://review.openstack.org/#/c/235781/ contains better fix

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/235781
Committed: https://git.openstack.org/cgit/stackforge/fuel-qa/commit/?id=9a1ab77fcd8ddc6f941c9fc298e79b9163913a30
Submitter: Jenkins
Branch: master

commit 9a1ab77fcd8ddc6f941c9fc298e79b9163913a30
Author: Dennis Dmitriev <email address hidden>
Date: Fri Oct 16 11:18:03 2015 +0300

    Use Fuel version 8.0 in fuel-qa master

    - use 7.0 for base version for upgrades, and 8.0 for target version
    - use 8.0 for testrail reports
    - use version-free path for fuel-createmirror

    Change-Id: I0d7b81085a076d1dbab0c3102a13631041c0c0c6
    Closes-Bug:#1506755