Merge changes from topic "bpfStats"

* changes:
  Use /proc/net/dev to get stats summary
  Add bpf support for NetworkStatsFactory
  Add BPF support for NetworkStatsService
tree: 4a6c4ec5b9bf31ea3066597987f8743f32c75d4c
  1. core/
  2. services/
  3. wifi/