Updates hydra: cdf470e Fix: switch puppet-common dependency

diff --git a/hydra b/hydra
index 1520ed9c229a95417da5433980d8c05514136ef5..cdf470e3aaf5983ea10009c8b5fc457491b14c29 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 1520ed9c229a95417da5433980d8c05514136ef5
+Subproject commit cdf470e3aaf5983ea10009c8b5fc457491b14c29