Chenbo Feng 93afbf258f Use /proc/net/dev to get stats summary ...

If the qtaguid proc file is no longer exist, the device is running new
eBPF module to do traffic accounting. So the NetworkStatsFactory need to
use the proc/net/dev interface to get the per interface traffic stats
summary. Also, adding a test to verify the helper function work properly

Bug: 30950746
Test: run NetworkStatsFactoryTest
Change-Id: Ia36808bf02f1637dd41a3e7c50917b91b1a77524

2018-01-23 00:35:02 -08:00

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Use /proc/net/dev to get stats summary

2018-01-23 00:35:02 -08:00