Aether-3088 change license to Apache-2.0

Change-Id: I42d7535e82065a8031119bee17594d3fb358a1e5
diff --git a/config-models/aether-4.x/files/yang/onf-ip-domain.yang b/config-models/aether-4.x/files/yang/onf-ip-domain.yang
index e896cc5..629256a 100755
--- a/config-models/aether-4.x/files/yang/onf-ip-domain.yang
+++ b/config-models/aether-4.x/files/yang/onf-ip-domain.yang
@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2021 Open Networking Foundation
 //
-// SPDX-License-Identifier: LicenseRef-ONF-Member-Only-1.0
+// SPDX-License-Identifier: Apache-2.0
 
 module onf-ip-domain {
   namespace "http://opennetworking.org/aether/ip-domain";