Add Docker specific settings

[drts01]

From https://github.com/moby/moby/blob/e2e5d4bc9da5ba17bb2822909611f8300fdd80f0/contrib/mkimage/debootstrap,

• setting dpkg unsafe-io
• allowing kernel autoremove

[andsens]

Nice job, especially with the references. I wouldn't add tasks from other plugins though (CreateDpkgCfg). I think it'd be much better to simply add a proper manifest example that causes that task to be added.

[drts01]

Yeah, using another plugin task like that felt dirty. So, I added at as a requirement. I also updated the docs and included two new manifest files for Docker.

[andsens]

The manifests & docs look great! Instead of using makedirs though, you should probably just move CreatDpkgCfg to common/ so that both plugins may add and depend on it.
After all that's partially why common/ exists :-)
The tasklist is a set, so there is no harm in adding a task twice.

[drts01]

updated :)

[andsens]

Perfect! Merging...