[system tests] Each test matched group command_line executed twice

[Tatyanka]

https://product-ci.infra.mirantis.net/job/8.0.system_test.ubuntu.command_line/23/testReport/

The same tests was executed twice
test
cli_selected_nodes_deploy 2 h40 m 0 0 2 2 was executed 2 times too

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/239959

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/239959
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=4e402e32e3c957492c25e8ff9d683ffb8da3c60c
Submitter: Jenkins
Branch: master

commit 4e402e32e3c957492c25e8ff9d683ffb8da3c60c
Author: Dmitry Tyzhnenko <email address hidden>
Date: Wed Oct 28 16:44:49 2015 +0200

    Divide the test and the class with useful methods

    Because CommandLine class used in
        create_backup_reset_restore_and_deploy_via_cli it should not have test
        decorator. Proboscis saves test function each time when module are
        imported

    Change-Id: I30fd2596f03f10992b0d743c7e375325b45bf90c
    Closes-bug: #1507999

[Tatyanka (tatyana-leontovich)]

Thank you Dima, it works perfect now!!!