CORD-2476 migrate olt service to dynamic load

Change-Id: I6e5041983422da8df12e25824eae400ce6114290
diff --git a/xos/synchronizer/volt_config.yaml b/xos/synchronizer/volt_config.yaml
index fdcd31f..b11266a 100644
--- a/xos/synchronizer/volt_config.yaml
+++ b/xos/synchronizer/volt_config.yaml
@@ -18,5 +18,12 @@
 accessor:
   username: xosadmin@opencord.org
   password: "@/opt/xos/services/volt/credentials/xosadmin@opencord.org"
+required_models:
+  - VOLTService
+  - VOLTTenant  
+  - VSGService
+  - VSGServiceInstance
+  - ServiceInstanceLink
 dependency_graph: "/opt/xos/synchronizers/volt/model-deps"
-model_policies_dir: "/opt/xos/synchronizers/volt/model_policies"
\ No newline at end of file
+model_policies_dir: "/opt/xos/synchronizers/volt/model_policies"
+models_dir: "/opt/xos/synchronizers/volt/models"