parse config file case sensitive (bnc#868231)

The bug https://bugzilla.novell.com/show_bug.cgi?id=868231 is fixed for SLE12 and SLE10 but not for SLE11.
(Apparently the "reason" for not putting the fix to SLE11 was that OES, where it hurts, had not been ported to SLE11 at that time.)