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