Adding AT&T specific Radius packet customizer. Currently it
avoids updating the nas ip attribute previously set from netcfg.

Change-Id: Ib2af6975c807a65e294e2a73c30a58535623cc26
diff --git a/src/main/java/org/opencord/aaa/AttPacketCustomizer.java b/src/main/java/org/opencord/aaa/AttPacketCustomizer.java
new file mode 100644
index 0000000..f133466
--- /dev/null
+++ b/src/main/java/org/opencord/aaa/AttPacketCustomizer.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.opencord.aaa;
+
+/**
+ * AT&T specific RADIUS packet customization.
+ *
+ */
+public class AttPacketCustomizer extends SamplePacketCustomizer {
+
+    public AttPacketCustomizer(CustomizationInfo customInfo) {
+        super(customInfo);
+    }
+
+    @Override
+    protected boolean updateNasIp() {
+        return false;
+    }
+
+}