[Scenario-tests] Tests in python-saharaclient fails on fake plugin

ENVIRONMENT: master of sahara-tests (9 march 2016)

STEPS TOREPRODUCE:
1. Run scenario-tests on sahara-ci from etc/scenario/defaults/fake.yaml.mako

EXPECTED RESULT:
Tests passed

ACTUAL RESULT:

Captured stdout:
~~~~~~~~~~~~~~~~
    Results of testing plugin fake 0.1
    +-----------------------------+--------+-------------+
    | Check | Status | Duration, s |
    +-----------------------------+--------+-------------+
    | Create node group templates | OK | 1 |
    | Set flavor | OK | 0 |
    | Set flavor | OK | 0 |
    | Create cluster template | OK | 0 |
    | Create cluster | OK | 4 |
    | Check cluster state | OK | 152 |
    | Check cinder volumes | FAILED | 1 |
    +-----------------------------+--------+-------------+

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/tmp/tmp8_ywlW/test_KCE4nz.py", line 13, in test_plugin
        self.create_cluster()
      File "sahara_tests/scenario/base.py", line 147, in create_cluster
        self.check_cinder()
      File "sahara_tests/scenario/base.py", line 59, in wrapper
        return fct(self, *args, **kwargs)
      File "sahara_tests/scenario/base.py", line 453, in check_cinder
        node_with_volumes['volume_mount_prefix']
      File "sahara_tests/scenario/base.py", line 608, in _run_command_on_node
        return ssh_session.exec_command(command)
      File "/tmp/sahara-tests/.tox/venv/local/lib/python2.7/site-packages/tempest_lib/common/ssh.py", line 168, in exec_command
        stderr=err_data, stdout=out_data)
    tempest_lib.exceptions.SSHExecCommandFailed: Command 'echo '-----BEGIN RSA PRIVATE KEY-----
    MIIEpAIBAAKCAQEAz+Ee33QV8NIhJ6T0KdMykCO9nFZxdhux6UcgoXasd8hXg4T7
    0V/G52IYJ/y9b6UnSiR4200B8CVidZSEHD1NmoCZ0AnsZZYfSobRM+MzlVVOSLSp
    XOzoUW0H+XfyJ2rdxjvbLtYJtOnbT+o6SNpDMVyu2wN6y49XPS+x/LdsXQ7fcAAa
    TTAPaafyEOMAJWJefdjOMYDIh6Ha4cz0BIl4TIIxPqoJ56brJs4GBzihT4K8bLig
    jC2GXKNr3iTc+e2IXNk3waeJOnHc+qz9GJ68wFQktYgsw4nsL6tz4eNyYV0923to
    /3QUjVtWDOMja7A7CTUHk7wRQ++qP7DzEodE3QIDAQABAoIBAQCMjhJp0/vh0LJK
    M+ZDQWG2w/O4eVpOGXu51zXg9nS2qOdDLe92KeQ7HsBmiSUtD+X446Az52WgEib4
    iWqqDWkjRkC5wXvtVAvkQDPDeaOvHPbJgh3hju2l4Kq7qrY4oLFDD8WrbV0yzcxT
    xHOUPr+f6KLxwvCMImdCH7WgwgSrBeJ6jA4ECPrkgasP98fc9eGiY3dYwE5lj4LU
    KPWqS+4fV/DNJYtP21wMcfNTqZS7voBYPwD756IS7sl+tKof9x3r0ZkQqi7z2BUy
    DXTdbBMwONvINWupdc7Lciy2qjUAqta4CkIm6RBYmkl5NwwA4HVG7s5rIIsx6FyO
    +Tys3oihAoGBAPkwnr49/JUUQINGsmJlxqKt7fqQhd3XpPvh2KkpRRmaH+vnKvfJ
    qz4zF2CaU/zanNUL7K692NnUSpPSxB71cubeMbSM1S29hcU1j7TAiIlwx/G3m7jF
    Vwd4No+nUIo+IZX4u0nrapiS+r9D8mX3/oy/d5wpBqNqcBOrAMbbgK97AoGBANWP
    e+56BBxjMmCXbSmTb+1m+TyQnv6enztSVq3tst/DlorS6EJ5004RcWnRexQuKo9L
    Wvs3tCAP5g9KA3hXM5s9ByeuogQOMKyIUp/FeokcuyIdwr4KTKKeN1Qd+Kgzr/1H
    i7KlDLlMoTB8H57y3AbkFWMh9861MmnYjGzibcGHAoGAPPgzbvK1sTgiTLxoewDR
    6A3MU2k3B79yg5qPq1wIpyn5s3t9HOF//5j6mE1KTWyjwNDJGTwkKa/yi1afW7/M
    XEZzPOzUX/umFklzntMY1R/+G9tDw6KtF4vHNcDHSPvItewEzyJFk40qws96KI7T
    /lX+ivvSvvsU7wsBBqbARq8CgYBuevwyMw1NYkP9lFj02UFeH5dwraCTOJxHpCET
    eZTADf8jcliVi1C1YnC5vZVeq0N5PhKjQ/37WD48Sp3g87vO45OAA+ftESo9F4km
    /pKVvDdTPvIwPkPHHPKioZ6x5Yt2DD1I/fnHIs2At7XkFN+e8P/feQMp/LNH7q82
    5SzCoQKBgQD1jAkEg/lqkG+AGlrHctBlJ2K0VI8REV75UoGLYuR31kDUwRiHgJ8n
    bd/7CGJr51aKcgaeCUMFCPpcXtsM6bPOw2G/xnVrskjvcxaa/RhVQQ83ORpPBhsa
    DudcZ1yPYGqmNSVPoIdI+ZeVhuLVYGnrpLcUefSI3frh05hKEsJZ8w==
    -----END RSA PRIVATE KEY-----
    ' > scenario.pem && chmod 600 scenario.pem && ssh 10.0.0.89 -i scenario.pem 'mount | grep /volumes/disk | wc -l' && rm scenario.pem', exit status: 255, stderr:
    Host key verification failed.

    stdout:

LOGS: https://sahara.mirantis.com/logs/06/285706/4/check/gate-saharaclient-distributed-heat-fake/44daf7a/console.html