Add bash completion for `--storage-opt dm.libdm_log_level`
Add bash completion for `--storage-opt dm.libdm_log_level`

This adds bash completion for https://github.com/moby/moby/pull/33845.

Signed-off-by: Harald Albers <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@albersweb.de>

ashfall/cli,ashfall/cli,dnephin/cli,allencloud/cli,Zebrilee/cli,redpanda/cli,allencloud/cli,dnephin/cli,thaJeztah/cli,thaJeztah/cli,cpuguy83/cli,docker/cli,docker/cli,redpanda/cli,cpuguy83/cli,Zebrilee/cli