Forward randomized SSH password to grml-quickconfig

[zeha]

The random SSH password is shown in the boot log, but this is invisible on VGA on arm64, and also on amd64 it usually just scrolls by.

We should show it in the grml-quickconfig output, at least once.

[zeha]

If we show the password only once, we should also implement an option to regenerate the password. Possibly this could also start the SSH server.

[jkirk]

I also was thinking of some kind of wrapper script grml-ssh which either asks the user for a password or creates a random one, sets the password for the users grml and root and starts sshd (similar to the boot option 'ssh').

This wrapper script could then be called out of grml-quickconfig.