Code cleanup and some fixes

Some cleanup and tests needed in order to be able to work on bnc#907907 with confidence.

Sorry for not separating in commits the zombie killing from the spliting into smaller methods, but the latter is very simple (just moving the code a little bit).

https://bugzilla.suse.com/show_bug.cgi?id=907907
I think it is nicer to use for hash `each_pair` which is more obvious