[qa] Tests on upgrade failed with no clear error

[Tatyanka]

http://jenkins-product.srt.mirantis.net:8080/view/5.0_swarm/job/5.0_fuelmain.system_test.centos.upgrade/20/consoleFull

Tests failed with 110 connection error, but we can see in the syslogs that snapshot was not found.
We should add to stable/5.0 for upgrade tests next check before tests
if not self.env.get_virtual_environment().has_snapshot('deploy_simple_cinder'):
raise SkipTest()

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/5.0
Review: https://review.openstack.org/108922

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/108922
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=84dad8ab9e6eccb7d4dedd2815c011bbc53e55d1
Submitter: Jenkins
Branch: stable/5.0

commit 84dad8ab9e6eccb7d4dedd2815c011bbc53e55d1
Author: asledzinskiy <email address hidden>
Date: Wed Jul 23 11:46:20 2014 +0300

    Add check that needed for test snapshot exists

    Change-Id: I5da344bfc9fdacd3dd9049aac5e8a5d98be542b8
    Closes-Bug: #1346947