CIS Benchmarks -- Docker Hosts --2.13 Ensure operations on legacy registry (v1) are Disabled

[amitaqua]

Seems we do not verify the values in the /etc/docker/daemon.json and thus fail the test.

So disable-legacy-registry configuration option has been removed base on below link (but in daemon.json file)
https://docs.docker.com/engine/reference/commandline/dockerd/

But the utility fails to find this and fails the test.