Updates hydra: c036977 TODO: external volume handling

diff --git a/hydra b/hydra
index b36564bf68ea5af165142ca372c6503a064a9ec6..c0369772171a8fc3c209b96ce6e29fc91d8db088 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit b36564bf68ea5af165142ca372c6503a064a9ec6
+Subproject commit c0369772171a8fc3c209b96ce6e29fc91d8db088