Set system keyboard

[nphilipp]

Cockpit should let admins configure the keyboard layout that are used on the virtual consoles and eventually running X servers.

[stefwalter]

@nphilipp Is this something you're interested in working on? I've placed it on our ideas page:

https://github.com/cockpit-project/cockpit/wiki/Ideas

[stefwalter]

Moved to the ideas page.