Changed to use network.service alias link instead of NETWORKMANAGER=yes/no

This is an update of yast/yast-yast2#44, requested because [bnc#798348](https://bugzilla.novell.com/show_bug.cgi?id=798348) has become an urgent shipstopper of openSUSE 12.3.

It does not address the code review comments, only fixes the merge conflict in VERSION and .changes.