Updates hydra: bb873d8 Deploy: use hostname cmd instead of facter

diff --git a/hydra b/hydra
index 3a4622b57877315a8e7221448718122d958dba39..bb873d81289eb21f67d1da1fa4d2efc204bd0dd5 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 3a4622b57877315a8e7221448718122d958dba39
+Subproject commit bb873d81289eb21f67d1da1fa4d2efc204bd0dd5