Master node fails during create and environment due to connection issue

6.0.1.staging.centos.bvt_1 and 6.0.1.staging.ubuntu.bvt_2 jobs fails du to connection issue during creation environment.

http://jenkins-product.srt.mirantis.net:8080/view/6.0.1/job/6.0.1.staging.centos.bvt_1/69/console

http://jenkins-product.srt.mirantis.net:8080/job/6.0.1.staging.ubuntu.bvt_2/67/console

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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/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/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/local/lib/python2.7/site-packages/proboscis/case.py", line 350, in func
    func(test_case.state.get_state())
  File "/home/jenkins/workspace/6.0.1.staging.centos.bvt_1/fuelweb_test/tests/base_test_case.py", line 57, in setup_master
    self.env.setup_environment()
  File "/home/jenkins/workspace/6.0.1.staging.centos.bvt_1/fuelweb_test/models/environment.py", line 501, in setup_environment
    self.set_admin_keystone_password()
  File "/home/jenkins/workspace/6.0.1.staging.centos.bvt_1/fuelweb_test/models/environment.py", line 474, in set_admin_keystone_password
    self._fuel_web.client.get_releases()
  File "/home/jenkins/workspace/6.0.1.staging.centos.bvt_1/fuelweb_test/__init__.py", line 48, in wrapped
    result = func(*args, **kwargs)
  File "/home/jenkins/workspace/6.0.1.staging.centos.bvt_1/fuelweb_test/helpers/decorators.py", line 96, in wrapped
    response = func(*args, **kwargs)
  File "/home/jenkins/workspace/6.0.1.staging.centos.bvt_1/fuelweb_test/models/nailgun_client.py", line 140, in get_releases
    return self.client.get("/api/releases/")
  File "/home/jenkins/workspace/6.0.1.staging.centos.bvt_1/fuelweb_test/helpers/http.py", line 67, in get
    return self._open(req)
  File "/home/jenkins/workspace/6.0.1.staging.centos.bvt_1/fuelweb_test/helpers/http.py", line 97, in _open
    return self._get_response(req)
  File "/home/jenkins/workspace/6.0.1.staging.centos.bvt_1/fuelweb_test/helpers/http.py", line 109, in _get_response
    return self.opener.open(req)
  File "/usr/lib/python2.7/urllib2.py", line 410, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 523, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 448, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 531, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 500: Internal Server Error

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