MTU feature setting. Docker networks issue.

[james-martinez]

I am working on using kasm in kubernetes and virtualization engines and running into a mtu issue. I am able to set the mtu in dockerd, but based on the docker compose file, the kasm_default_network doesn't configure the mtu.
see
linuxserver/docker-kasm#32 (comment)
Drone ci works the same.
see
https://github.com/drone/charts/blob/master/charts/drone-runner-docker/docs/install.md#docker-in-docker-mtu