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
gsub not needed, simple tr is enough http://www.ruby-doc.org/core-2.1.5/String.html#method-i-tr