[systest] List on devops nodes is not sorted in prepare_slaves_* tests

[Artem Panchenko]

After the following patch was merged we started to use unsorted list of nodes in system tests which prepare slaves:

https://github.com/openstack/fuel-qa/commit/04693990cb186a50fca817ff701160c924347983

This cause tests failure, because unexpected slaves are bootstrapped while in deployment cases we use predefined names:

https://github.com/openstack/fuel-qa/blob/master/fuelweb_test/tests/test_neutron_tun.py#L74

                                                       <<< 2. Start 3 slave nodes >>>
2015-12-23 12:35:20,795 - INFO environment.py:124 -- Bootstrapping node: slave-02
2015-12-23 12:35:26,775 - INFO environment.py:124 -- Bootstrapping node: slave-03
2015-12-23 12:35:32,708 - INFO environment.py:124 -- Bootstrapping node: slave-04

======================================================================
ERROR: Deploy cluster in ha mode with 1 controller and Neutron VXLAN
----------------------------------------------------------------------
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/8.0.ubuntu.smoke_neutron/fuelweb_test/helpers/decorators.py", line 81, in wrapper
    result = func(*args, **kwargs)
  File "/home/jenkins/workspace/8.0.ubuntu.smoke_neutron/fuelweb_test/tests/test_neutron_tun.py", line 76, in deploy_neutron_tun
    'slave-03': ['compute', 'cinder']
  File "/home/jenkins/workspace/8.0.ubuntu.smoke_neutron/fuelweb_test/__init__.py", line 57, in wrapped
    result = func(*args, **kwargs)
  File "/home/jenkins/workspace/8.0.ubuntu.smoke_neutron/fuelweb_test/models/fuel_web_client.py", line 1119, in update_nodes
    timeout=60 * 2)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/devops/helpers/helpers.py", line 92, in wait
    while not predicate():
  File "/home/jenkins/workspace/8.0.ubuntu.smoke_neutron/fuelweb_test/models/fuel_web_client.py", line 1118, in <lambda>
    self.get_nailgun_node_by_devops_node(devops_node)['online'],
TypeError: 'NoneType' object has no attribute '__getitem__'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/260983

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/260983
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=7e4be4fac9841b85b14b2bcfffea672bf683f288
Submitter: Jenkins
Branch: master

commit 7e4be4fac9841b85b14b2bcfffea672bf683f288
Author: Artem Panchenko <email address hidden>
Date: Wed Dec 23 13:52:23 2015 +0000

    Revert "Test for postdeploy plugin install and enable."

    This reverts commit 04693990cb186a50fca817ff701160c924347983.

    Change-Id: I367076c393e4a7cb356c66624d4402aa4d646f3d
    Closes-bug: #1528858

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/8.0
Review: https://review.openstack.org/260988

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/260988
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=97143e36af04f9a79a3ea94564824543ff174fe7
Submitter: Jenkins
Branch: stable/8.0

commit 97143e36af04f9a79a3ea94564824543ff174fe7
Author: Artem Panchenko <email address hidden>
Date: Wed Dec 23 13:52:23 2015 +0000

    Revert "Test for postdeploy plugin install and enable."

    This reverts commit 04693990cb186a50fca817ff701160c924347983.

    Change-Id: I367076c393e4a7cb356c66624d4402aa4d646f3d
    Closes-bug: #1528858
    (cherry picked from commit 7e4be4fac9841b85b14b2bcfffea672bf683f288)