Review test for fuel-library fails with 'NoneType' object has no attribute '__getitem__'

[Tatyanka]

we do not store in result variable output of executed cmd and then try to get item in this variable as result test failed:
ERROR: Create environment and set up master node
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/case.py", line 296, in testng_method_mistake_capture_func
    compatability.capture_type_error(s_func)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/compatability/exceptions_2_6.py", line 27, in capture_type_error
    func()
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/case.py", line 350, in func
    func(test_case.state.get_state())
  File "/home/jenkins/workspace/systest/8.0/fuelweb_test/helpers/decorators.py", line 83, in wrapper
    result = func(*args, **kwargs)
  File "/home/jenkins/workspace/systest/8.0/fuelweb_test/tests/base_test_case.py", line 141, in setup_master
    self.env.setup_environment()
  File "/home/jenkins/workspace/systest/8.0/fuelweb_test/models/environment.py", line 440, in setup_environment
    self.setup_customisation()
  File "/home/jenkins/workspace/systest/8.0/fuelweb_test/helpers/decorators.py", line 226, in wrapper
    assert_equal(int(result['exit_code']), 0,
TypeError: 'NoneType' object has no attribute '__getitem__'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/265263

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/8.0
Review: https://review.openstack.org/265265

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/265263
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=b92e7f53f3414725a379ead51a1ea8586a02dae7
Submitter: Jenkins
Branch: master

commit b92e7f53f3414725a379ead51a1ea8586a02dae7
Author: Tatyana Leontovich <email address hidden>
Date: Fri Jan 8 16:15:25 2016 +0200

    Store cmd execute result into cmd_result variable

    Change-Id: Ie4dc39c231e026109b28b79c609c272d46df959e
    Closes-Bug: #1532203

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/265265
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=7bd862861189b59e6a486887f684f808bf0ea23c
Submitter: Jenkins
Branch: stable/8.0

commit 7bd862861189b59e6a486887f684f808bf0ea23c
Author: Tatyana Leontovich <email address hidden>
Date: Fri Jan 8 16:15:25 2016 +0200

    Store cmd execute result into cmd_result variable

    Change-Id: Ie4dc39c231e026109b28b79c609c272d46df959e
    Closes-Bug: #1532203