CORD-1256 Implement LoadModels

Change-Id: I4546f32bd7272e219f887782d30780e702e10412
diff --git a/lib/xos-config/xosconfig/synchronizer-config-schema.yaml b/lib/xos-config/xosconfig/synchronizer-config-schema.yaml
index bafc8e5..dd25888 100644
--- a/lib/xos-config/xosconfig/synchronizer-config-schema.yaml
+++ b/lib/xos-config/xosconfig/synchronizer-config-schema.yaml
@@ -59,6 +59,8 @@
     type: str
   sys_dir:
     type: str
+  models_dir:
+    type: str
   accessor:
     type: map
     required: True