Add an option to start the SSH server

[jkirk]

I often forget to add the boot option ssh=$PASSWORD.

I then need to do the following:

root@grml ~ # Start ssh
root@grml ~ # passwd 

It would be nice to have a grml-quickconfig option which then prompts for a password (or generates a random one) and starts the SSH-Server (similar to the ssh boot option).

[zeha]

Please also add an openqa testcase.