Changed format of interface class acitivity message.

For the sake of consistency, format of interface class activity message
is changed to "NNN IfaceClass <active/idle> <label>" and using single
response code for interface class activity.

Change-Id: I34dc5c37cc611d05172060b2a1e4ceac0a0f0588
diff --git a/ResponseCode.h b/ResponseCode.h
index 8ae3d91..807f91a 100644
--- a/ResponseCode.h
+++ b/ResponseCode.h
@@ -72,7 +72,6 @@
     static const int ServiceSetHostnameSuccess      = 610;
     static const int ServiceGetAddrInfoFailed       = 611;
     static const int ServiceGetAddrInfoSuccess      = 612;
-    static const int InterfaceClassActive           = 613;
-    static const int InterfaceClassIdle             = 614;
+    static const int InterfaceClassActivity         = 613;
 };
 #endif