Problems with current TrafficStats.getTotal[RT]XBytes()
implementation:
* Tethering related traffic is not counted at all.
* If you have a VPN active, stats are double counted.
So change the approach and track traffic on all non-VPN Internet
capable networks since:
* Tethering traffic is included in interface specific stats
(unlike getTotal*).
* VPN networks are excluded so no longer double counted.
* Works correctly regardless of hotspot "Allow clients to use
VPNs" hotspot setting.
* Works with simultaneous wifi ap and wifi upstream.
(WIFI_HIDL_FEATURE_DUAL_INTERFACE = true)
Change-Id: Ic1135f10388b5be427202b092acd1444f94bd2b6
453cab629f