Updates hydra: aa0e58f Back to classic ssh-finger method, but with file checking

diff --git a/hydra b/hydra
index 78fd7ea812a869dbf95d31db0dcaa0732348e840..aa0e58fb719abf9081179ef122f93a3a11356067 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 78fd7ea812a869dbf95d31db0dcaa0732348e840
+Subproject commit aa0e58fb719abf9081179ef122f93a3a11356067