[system_tests] assert_release_state function value should be reterned in lower space

[Alexander Kurenyshev]

Test "Deploy cluster in simple mode with zabbix-server" fails because function assert_release_state gets value from api not in lower case (searches "ubuntu" in "Juno on Ubuntu 12.04.4").

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/147564

[Nastya Urlapova (aurlapova)]

Sorry guys, I broke this code, my apologies.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/147564
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=bbd3cf6043efd4b442e28215a39279e3305d8306
Submitter: Jenkins
Branch: master

commit bbd3cf6043efd4b442e28215a39279e3305d8306
Author: Tatyana Leontovich <email address hidden>
Date: Thu Jan 15 18:00:09 2015 +0200

    Fix zabbix tets

    Add lower() to the fuel_web_client.assert_release_state

    Change-Id: I04824295d1a7c86762f459dcb1ae8dc793bdb70b
    Closes-Bug: #1411274