Updates hydra: 9149121 Fix: provision: minor grub fixes

diff --git a/hydra b/hydra
index 43c95d9908cd44b6e5a59ce3523e59c7f88b65c3..91491219056d4cffe0373ccedfd6b1ccce4f0809 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 43c95d9908cd44b6e5a59ce3523e59c7f88b65c3
+Subproject commit 91491219056d4cffe0373ccedfd6b1ccce4f0809