**Description of your changes:**
This modification adds the information extracted from 'ceph-volume inventory':
command to the device configmaps generated by the discovery daemon when
"rook discover" starts with the new boolean "--use-ceph-volume" parameter.
Resolves #
https://github.com/rook/rook/issues/2606
Now the <cephVolumeData> field contains all the information returned
from <ceph-volume inventory> command.
Signed-off-by: Juan Miguel Olmo Martínez <jolmomar@redhat.com>