regression: add fs/traceless

Signed-off-by: Sage Weil <sage@inktank.com>

diff --git a/suites/regression/fs-traceless b/suites/regression/fs-traceless
new file mode 120000 (symlink)
index 0000000..df75523
--- /dev/null
+++ b/suites/regression/fs-traceless
@@ -0,0 +1 @@
+../fs/traceless
\ No newline at end of file