Local repositories

I only tested this with a local susecloud3 setup and to be honest I'm not 100% sure if I use the correct repos for every usecase.
The crowbar admin node does not really need this value. atm it only uses it for test -n
instead maybe set localreposdir_target="" if unused and in qa_crowbarsetup use [ -n "$localreposdir_target" ]
This also slightly simplifies the code in L136