Fix for issues preventing cluster bootstrap

Small fixes found when adding support for drac cluster.

They are related to changes that happened after the last new cluster addition, so it's normal to catch them now while adding a new cluster.

lib/refrepo/valid/input/schemas/schema-node.yaml

@@ -23,11 +23,13 @@ chassis:
 exotic: optional_boolean
 gpu_devices: optional_hash
 kavlan:
-  <multi>:
-    <multi>: ip_address
+  <optional_hash>:
+    <multi>:
+      <multi>: ip_address
 kavlan6:
-  <multi>:
-    <multi>: ip_address
+  <optional_hash>:
+    <multi>:
+      <multi>: ip_address
 main_memory:
   ram_size: integer
   pmem_size: optional_integer