Fixed boot.log reference. bnc#879399
Updated changelog
Merge pull request #250 from mchf/bnc879399-system-log

Reffer to boot.log instead of boot.msg
Added check for existence of /etc/modules.d directory

- bnc#879428
Adapted test case
Changes and version
Changes from PR review
Fixed ENV["Y2DIR"]
Fixed double negation in error text
Merge pull request #251 from kobliha/fix_no_modules_to_load_error

Added check for existence of /etc/modules.d directory