Adopted restart for use with network.service alias link

This is an update of yast/yast-network#47, requested because [bnc#798348](https://bugzilla.novell.com/show_bug.cgi?id=798348) has become an urgent shipstopper of openSUSE 12.3.

The code review comments have been addressed in later commits included, except they are not squashed. Fixed the merge conflict in VERSION and .changes, bumped the dependency on yast2.rpm accordingly.