ceph: print the c-v output when inventory command fails
ceph: print the c-v output when inventory command fails

Hopefully, this will give us more hints when a failure occurs.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

rook/rook,rook/rook,rook/rook,rook/rook,rook/rook