Read iface stats from single proc file.

When available, use single "iface_stat_all" file instead of reading
values from dozens of files scattered across proc.  Tests to verify.

Bug: 5397840
Change-Id: I0247be518436c1f79b32c4b72216739f49a9e8cc
2 files changed
tree: 8eac3e7fedffbbcc89938c507144c641276a27c4
  1. core/
  2. services/