CBLT-319:  release and undo don't need TMP_DIR

Change-Id: I0e842b28db0f5f5688ee61eadb7948074f7b9e96
Reviewed-on: http://review.couchbase.org/38582
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>