Add a class lable parameter to idletimer.

Now the idletimer should be setup by this command:
ndc idletimer add <interface> <timeout> <class label>

Class label can be a number or string to identify device type, such as
mobile or wifi. Idletimer will send label in the netd message instead
of the actual interface name.

Change-Id: Ic8b69dc5e38a4436c74723697905643a1214aa2a
diff --git a/NetlinkHandler.h b/NetlinkHandler.h
index fe82934..50bface 100644
--- a/NetlinkHandler.h
+++ b/NetlinkHandler.h
@@ -38,6 +38,6 @@
     void notifyInterfaceChanged(const char *name, bool isUp);
     void notifyInterfaceLinkChanged(const char *name, bool isUp);
     void notifyQuotaLimitReached(const char *name, const char *iface);
-    void notifyInterfaceActivity(const char *name, bool isActive);
+    void notifyInterfaceClassActivity(const char *name, bool isActive);
 };
 #endif