mount_flags - causing installation problems

[agstephens]

/usr/lib/systemd/system/docker.service.d/mount_flags.conf - caused a failure:

fatal: [esgfidp-test-v4]: FAILED! => {"changed": false, "msg": "Error starting container 
c18494980d781967403b8fcc00f3a3c8b25fd37b2afaba2261a28fe30a04316f: 400 Client Error for 
http+docker://localhost/v1.41/containers/c18494980d781967403b8fcc00f3a3c8b25fd37b2afaba2261a28fe30a04316f/start: 
Bad Request (\"failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: 
exec: \"/usr/local/bin/tini\": stat /usr/local/bin/tini: permission denied: unknown\")"}

Worked around by removing the mount_flags, doing a daemon-reload and a restart of docker.

This brings up the question: What does this do? Can we work without it?

I hope it is not so Python 2 can be used; we should be moving to Python3.