Unable to wipe docker storage due to logical volume containing filesystem in use

Issue

OpenShift uninstall playbook fails with:

  2018-06-14 14:57:10,681 p=40718 u=root |  TASK [Wipe out Docker storage contents] *************************************************************************************************************************************
  2018-06-14 14:57:11,244 p=40718 u=root |  failed: [xx.xx.xx.xx] (item=  dockervg) => {"changed": true, "cmd": ["vgremove", "-f", "dockervg"], "delta": "0:00:00.016968", "end": "2018-06-14 14:57:11.222545", "failed": true, "item": "  dockervg", "msg": "non-zero return code", "rc": 5, "start": "2018-06-14 14:57:11.205577", "stderr": "  Logical volume dockervg/dockerlv contains a filesystem in use.", "stderr_lines": ["  Logical volume dockervg/dockerlv contains a filesystem in use."], "stdout": "", "stdout_lines": []}