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/AaaManager.java b/src/main/java/org/opencord/aaa/AaaManager.java
index b527d91..b6b417d 100755
--- a/src/main/java/org/opencord/aaa/AaaManager.java
+++ b/src/main/java/org/opencord/aaa/AaaManager.java
@@ -243,6 +243,10 @@
                 pktCustomizer = new SamplePacketCustomizer(customInfo);
                 log.info("Created SamplePacketCustomizer");
                 break;
+            case "att":
+                pktCustomizer = new AttPacketCustomizer(customInfo);
+                log.info("Created AttPacketCustomizer");
+                break;
             default:
                 pktCustomizer = new PacketCustomizer(customInfo);
                 log.info("Created default PacketCustomizer");