Updates hydra: 5312bf5 Provision: fix boot_size calculation

diff --git a/hydra b/hydra
index e9615875197c0b18469f274daa3e1849c45b753d..5312bf527f6bd256cd7c3bd948a722a6e7b06112 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit e9615875197c0b18469f274daa3e1849c45b753d
+Subproject commit 5312bf527f6bd256cd7c3bd948a722a6e7b06112