[7.0] OSTF tests sometimes fails after turning off and turning on master rabbit

[Vadim Rovachev]

Swarm test https://github.com/openstack/fuel-qa/blob/stable/7.0/fuelweb_test/tests/tests_strength/test_failover.py#L292 sometimes fails on step 13: https://github.com/openstack/fuel-qa/blob/stable/7.0/fuelweb_test/tests/tests_strength/test_failover.py#L308
in line: https://github.com/openstack/fuel-qa/blob/stable/7.0/fuelweb_test/tests/tests_strength/test_failover_base.py#L1026
Diag snap:
https://drive.google.com/a/mirantis.com/file/d/0BxAwYghQ8JfbMVBnWEdUZ1A0cXM/view

[Bug Checker Bot (bug-checker)]

(This check performed automatically)
Please, make sure that bug description contains the following sections filled in with the appropriate data related to the bug you are describing:

actual result

version

expected result

steps to reproduce

For more detailed information on the contents of each of the listed sections see https://wiki.openstack.org/wiki/Fuel/How_to_contribute#Here_is_how_you_file_a_bug

[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.