- save Autologin settings at the end of installation (bnc#863436)

This fixes Bug 863436 - Automatic login setting in the installation UI have no effect after system been installed.

Few notes, however:
 - it would be better to directly operate with Autologin module in inst_user_first, instead of going via UsersSimple module. The original usage of UsersSimple was there because it has a way of saving the settings to data file which would be used in 2nd stage of installation.

- the root aliases thing is obviously missing as well, so I've added it, however it does not seem to do the job. Please someone investigate.