[7.0] MAC adresses list not full

[Dmitry Belyaninov]

Detailed bug description:
7.0 Swarm tests
Traceback (most recent call last):
...
  File "/home/jenkins/workspace/7.0.system_test.ubuntu.ha_neutron_destructive_2/fuelweb_test/tests/tests_strength/test_neutron.py", line 280, in neutron_l3_migration_after_reset
    self.fuel_web.warm_restart_nodes([new_devops])
  File "/home/jenkins/workspace/7.0.system_test.ubuntu.ha_neutron_destructive_2/fuelweb_test/models/fuel_web_client.py", line 1649, in warm_restart_nodes
    self.warm_shutdown_nodes(devops_nodes)
  File "/home/jenkins/workspace/7.0.system_test.ubuntu.ha_neutron_destructive_2/fuelweb_test/models/fuel_web_client.py", line 1622, in warm_shutdown_nodes
    'online'], timeout=60 * 10)
  File "/home/jenkins/qa-venv-7.0/local/lib/python2.7/site-packages/devops/helpers/helpers.py", line 92, in wait
    while not predicate():
  File "/home/jenkins/workspace/7.0.system_test.ubuntu.ha_neutron_destructive_2/fuelweb_test/models/fuel_web_client.py", line 1622, in <lambda>
    'online'], timeout=60 * 10)
TypeError: 'NoneType' object has no attribute '__getitem__'
Steps to reproduce:
run neutron_l3_migration_after_reset test
Expected results:
passed
Actual result:
failed
Reproducibility:
no data
Workaround:
no data
Impact:
SWARM failing
Description of the environment:
according to test description
Additional information:
https://mirantis.testrail.com/index.php?/tests/view/3924319
2016-04-03 19:22:22,639 - DEBUG fuel_web_client.py:1009 -- Look for macs returned by nailgun set([EUI('64-3C-41-5B-C9-40'), EUI('64-44-FD-ED-66-5D'), EUI('64-DB-E1-23-9A-22'), EUI('64-06-13-7D-D2-57'), EUI('64-EA-1B-6B-38-FA')])
==>
2016-04-03 19:22:28,143 - DEBUG fuel_web_client.py:1009 -- Look for macs returned by nailgun set([EUI('64-44-FD-ED-66-5D'), EUI('64-06-13-7D-D2-57')])

[Alexey Stupnikov (astupnikov)]

We no longer support MOS5.1, MOS6.0, MOS6.1
We deliver only Critical/Security fixes to MOS7.0, MOS8.0.
We deliver only High/Critical/Security fixes to MOS9.2.