Updates hydra: b7311dc Provision improvements and fixes

diff --git a/hydra b/hydra
index df332569de1162bd9a4deeb4c2c5271cbfdee6ad..b7311dc95f4fb020580be7be7d5c0e8a278e326b 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit df332569de1162bd9a4deeb4c2c5271cbfdee6ad
+Subproject commit b7311dc95f4fb020580be7be7d5c0e8a278e326b