NetworkManagementService: receive bandwidth controller events

This is a 1st pass at receiving events that indicate
some quota has been reached e.g. warning quota, data collection quota,
 cutoff quota,...

It needs:
  - new kernel with quota2 logging support
  - new net:bandwidthcontroller that supports
    . quota2,
    . setting alerts.
  - new NetlinkEvent/NetlinkManager/NetlinkHandler to process
     NETLINK NFLOG messages.

Change-Id: Ibfbb13512c5350cdee0e544ec14caa6f59812409
diff --git a/services/java/com/android/server/ThrottleService.java b/services/java/com/android/server/ThrottleService.java
index b8890aa..cd649ce 100644
--- a/services/java/com/android/server/ThrottleService.java
+++ b/services/java/com/android/server/ThrottleService.java
@@ -194,6 +194,7 @@
         }
 
         public void interfaceRemoved(String iface) {}
+        public void limitReached(String limitName, String iface) {}
     }