Anaconda gets stuck while installing the master node

[Roman Podoliaka]

Master node never becomes available over SSH during setup:

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ERROR: Create environment and set up master node
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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/9.0.main.ubuntu.bvt_2/fuelweb_test/helpers/decorators.py", line 96, in wrapper
    with args[0].env.d_env.get_admin_remote()\
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/devops/models/environment.py", line 395, in get_admin_remote
    password=password)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/devops/models/node.py", line 171, in remote
    password=password, private_keys=private_keys)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/devops/helpers/helpers.py", line 257, in __init__
    self.reconnect()
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/devops/helpers/helpers.py", line 300, in reconnect
    self.connect()
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/devops/helpers/retry.py", line 27, in wrapper
    return func(*args, **kwargs)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/devops/helpers/helpers.py", line 295, in connect
    password=self.password)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/paramiko/client.py", line 311, in connect
    raise NoValidConnectionsError(errors)
NoValidConnectionsError: [Errno None] Unable to connect to port 22 on or 10.109.40.2

Screen (attached) shows that anaconda is stuck waiting for one of its threads to finish, but that never happens after revert of an environment.

Failed build: https://product-ci.infra.mirantis.net/job/9.0.main.ubuntu.bvt_2/63/console