Ceph » ceph-volume

If 'ceph-bluestore-tool' fails on a device, the json output of the list
command will be messed up. Ignoring stderr of that command fixes this.

See:

[root@rook-ceph-osd-prepare-minikube-tvcbb /]# ceph-volume raw list
 stderr: unable to read label for /dev/vdd: (2) No such file or directory
{
    "0": {
        "ceph_fsid": "7ec3d9fd-ada3-4bcb-9f2b-8deea05fe480",
        "device": "/dev/vdb",
        "osd_id": 0,
        "osd_uuid": "979b298c-58c9-4220-96f2-d6ea6d7bdf61",
        "type": "bluestore" 
    },
    "1": {
        "ceph_fsid": "7ec3d9fd-ada3-4bcb-9f2b-8deea05fe480",
        "device": "/dev/vdc",
        "osd_id": 1,
        "osd_uuid": "702d550b-8d61-44b3-a863-9814cf767f0c",
        "type": "bluestore" 
    }
}