Complete all known driver options if no log driver was specified
Complete all known driver options if no log driver was specified

Without this fix, `docker --log-opt ` would not complete anything
because the completions were driver specific.

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

e11137/cli,redpanda/cli,docker/cli,Zebrilee/cli,dnephin/cli,dnephin/cli,redpanda/cli,thaJeztah/cli,ashfall/cli,Zebrilee/cli,allencloud/cli,thaJeztah/cli,cpuguy83/cli,cpuguy83/cli,allencloud/cli,riyazdf/cli,e11137/cli,riyazdf/cli,ashfall/cli,docker/cli