add hostManagementIface to autogeneration

Change-Id: Ibecd39d3c58cabb03eb4ec0e5daaec0a9b66e022
diff --git a/xos/synchronizer/steps/sync_onos_netcfg.py b/xos/synchronizer/steps/sync_onos_netcfg.py
index e12e242..7e76cc9 100644
--- a/xos/synchronizer/steps/sync_onos_netcfg.py
+++ b/xos/synchronizer/steps/sync_onos_netcfg.py
@@ -119,6 +119,13 @@
                 "dataPlaneIntf": dataPlaneIntf,
                 "dataPlaneIp": dataPlaneIp
             }
+
+            # this one is optional
+            try:
+                node_dict["hostManagementIface"] = self.get_node_tag(node, "hostManagementIface")
+            except IndexError:
+                pass
+
             data["apps"]["org.opencord.vtn"]["cordvtn"]["nodes"].append(node_dict)
 
         # Generate apps->org.onosproject.cordvtn->cordvtn->publicGateways