The test was renumbered and committed.
Thanks
--Rich
commit 56a3959a96f1b5e046b3760778fd34b4911d0516
Author: Josef Bacik <jbacik at fusionio.com>
Date: Fri Sep 27 13:55:37 2013 +0000
xfstests: btrfs/015: add a regression test for snapshot creation