testHiddenLuks (check_storage_hidden.TestStorage) is flaky

[cockpituous]

91% on verify/rhel-7-5-distropkg

• http://fedorapeople.org/groups/cockpit/logs/pull-10291-20181014-102222-241aa890-verify-rhel-7-5-distropkg/log

82% on verify/centos-7

• http://fedorapeople.org/groups/cockpit/logs/pull-10291-20181014-101616-241aa890-verify-centos-7/log

76% on verify/rhel-x

• http://fedorapeople.org/groups/cockpit/logs/pull-10572-20181113-191212-da56314b-verify-rhel-x/log
• http://fedorapeople.org/groups/cockpit/logs/pull-10291-20181014-102222-241aa890-verify-rhel-x/log
• http://fedorapeople.org/groups/cockpit/logs/pull-10248-20181009-062626-a5f9fa68-verify-rhel-x/log

94% on verify/fedora-28

• http://fedorapeople.org/groups/cockpit/logs/pull-10291-20181014-101919-241aa890-verify-fedora-28/log

93% on verify/fedora-i386

• http://fedorapeople.org/groups/cockpit/logs/pull-10488-20181101-163838-5baa3a3e-verify-fedora-i386/log
• http://fedorapeople.org/groups/cockpit/logs/pull-10291-20181014-101919-241aa890-verify-fedora-i386/log

78% on verify/fedora-29

• http://fedorapeople.org/groups/cockpit/logs/pull-10452-20181027-070707-ee73e176-verify-fedora-29/log
• http://fedorapeople.org/groups/cockpit/logs/pull-10301-20181015-200606-71a065a7-verify-fedora-29/log
• http://fedorapeople.org/groups/cockpit/logs/pull-10291-20181014-101515-241aa890-verify-fedora-29/log

89% on verify/rhel-7-6-distropkg

• http://fedorapeople.org/groups/cockpit/logs/pull-10582-20181115-141010-acdb9183-verify-rhel-7-6-distropkg/log
• http://fedorapeople.org/groups/cockpit/logs/pull-10569-20181115-094343-33ff7e65-verify-rhel-7-6-distropkg/log
• http://fedorapeople.org/groups/cockpit/logs/pull-10528-20181115-113535-104d6f2c-verify-rhel-7-6-distropkg/log
• http://fedorapeople.org/groups/cockpit/logs/pull-10291-20181014-101818-241aa890-verify-rhel-7-6-distropkg/log

Source material

{
  "test": [
    [
      "testHiddenLuks (check_storage_hidden.TestStorage)",
      24
    ]
  ],
  "status": [
    [
      "failure",
      24
    ]
  ],
  "tracker": [
    [
      null,
      24
    ]
  ],
  "context": [
    [
      "verify/rhel-7-5-distropkg",
      24
    ]
  ],
  "merged": [
    [
      true,
      22
    ],
    [
      false,
      2
    ]
  ],
  "date": [
    "2018-07-30T21:13:00Z",
    "2018-10-14T10:53:43Z"
  ]
}
{
  "test": [
    [
      "testHiddenLuks (check_storage_hidden.TestStorage)",
      23
    ]
  ],
  "status": [
    [
      "failure",
      23
    ]
  ],
  "tracker": [
    [
      null,
      23
    ]
  ],
  "context": [
    [
      "verify/centos-7",
      23
    ]
  ],
  "merged": [
    [
      true,
      19
    ],
    [
      false,
      4
    ]
  ],
  "date": [
    "2018-08-07T09:50:42Z",
    "2018-10-14T10:51:03Z"
  ]
}
{
  "test": [
    [
      "testHiddenLuks (check_storage_hidden.TestStorage)",
      30
    ]
  ],
  "status": [
    [
      "failure",
      30
    ]
  ],
  "tracker": [
    [
      null,
      30
    ]
  ],
  "context": [
    [
      "verify/rhel-x",
      30
    ]
  ],
  "merged": [
    [
      true,
      23
    ],
    [
      false,
      7
    ]
  ],
  "date": [
    "2018-07-24T08:41:19Z",
    "2018-11-13T19:52:28Z"
  ]
}
{
  "test": [
    [
      "testHiddenLuks (check_storage_hidden.TestStorage)",
      17
    ]
  ],
  "status": [
    [
      "failure",
      17
    ]
  ],
  "tracker": [
    [
      null,
      17
    ]
  ],
  "context": [
    [
      "verify/fedora-28",
      17
    ]
  ],
  "merged": [
    [
      true,
      16
    ],
    [
      false,
      1
    ]
  ],
  "date": [
    "2018-08-31T13:20:28Z",
    "2018-10-14T10:57:32Z"
  ]
}
{
  "test": [
    [
      "testHiddenLuks (check_storage_hidden.TestStorage)",
      15
    ]
  ],
  "status": [
    [
      "failure",
      15
    ]
  ],
  "tracker": [
    [
      null,
      15
    ]
  ],
  "context": [
    [
      "verify/fedora-i386",
      15
    ]
  ],
  "merged": [
    [
      true,
      14
    ],
    [
      false,
      1
    ]
  ],
  "date": [
    "2018-08-31T13:35:35Z",
    "2018-11-01T17:16:25Z"
  ]
}
{
  "test": [
    [
      "testHiddenLuks (check_storage_hidden.TestStorage)",
      14
    ]
  ],
  "status": [
    [
      "failure",
      14
    ]
  ],
  "tracker": [
    [
      null,
      14
    ]
  ],
  "context": [
    [
      "verify/fedora-29",
      14
    ]
  ],
  "merged": [
    [
      true,
      11
    ],
    [
      false,
      3
    ]
  ],
  "date": [
    "2018-09-04T17:55:58Z",
    "2018-10-27T07:57:37Z"
  ]
}
{
  "test": [
    [
      "testHiddenLuks (check_storage_hidden.TestStorage)",
      19
    ]
  ],
  "status": [
    [
      "failure",
      19
    ]
  ],
  "tracker": [
    [
      null,
      19
    ]
  ],
  "context": [
    [
      "verify/rhel-7-6-distropkg",
      19
    ]
  ],
  "merged": [
    [
      true,
      17
    ],
    [
      false,
      2
    ]
  ],
  "date": [
    "2018-09-21T14:16:24Z",
    "2018-11-15T15:02:34Z"
  ]
}