FIX: symlinked /srv/cvmfs/<fqrn> failed in create_repository_skeleton()
FIX: potentially undefined (lower case) variable
REGRESSION TEST: check symlinked backend storage
TEST: symlinked backend for a stratum1 replica
Merge pull request #397 from reneme/fix-data_store_symlink

FIX: Symlinked Data Storage Wasn't Handled Correctly