Comment 0 for bug 1618022

The same situation as described here [1] but under 9.1 SWARM test, so it seems to be regression.

Test `Check VM backed with ceph migration in ha mode with 1 controller` failed [2] with an error:

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/9.x.system_test.ubuntu.ceph_ha_one_controller/fuelweb_test/helpers/decorators.py", line 121, in wrapper
    result = func(*args, **kwargs)
  File "/home/jenkins/workspace/9.x.system_test.ubuntu.ceph_ha_one_controller/fuelweb_test/tests/test_ceph.py", line 807, in migrate_vm_backed_with_ceph
    "File is absent in /mnt")
AssertionError: File is absent in /mnt

[1] https://bugs.launchpad.net/fuel/+bug/1588808
[2] https://product-ci.infra.mirantis.net/job/9.x.system_test.ubuntu.ceph_ha_one_controller/40/console