Feature 10906: Support for Anti-Affinity groups

Change-Id: Id14d9a02d4d66f678affb3e80a9169fc57eb452d
Signed-off-by: Alexis Romero <garomero@indra.es>
diff --git a/NG-RO/osm_ng_ro/validation.py b/NG-RO/osm_ng_ro/validation.py
index 91ea613..ca8cbc2 100644
--- a/NG-RO/osm_ng_ro/validation.py
+++ b/NG-RO/osm_ng_ro/validation.py
@@ -107,6 +107,7 @@
                 "vld": deploy_item_list,
             },
         },
+        "affinity-or-anti-affinity-group": deploy_item_list,
     },
     "additionalProperties": False,
 }