Revert "Use directory xattrs for symlinks"
This reverts commit 6a7c0ccca44ad02c476a111d8f7911fc8b12fff7.
A proper fix for Issue #1648 was landed under Issue #1890, so this is no
longer needed.
Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1648