[automerger skipped] Make Ethernet interfaces more testable. am: fb336e9296 am: 5cc44b3cdd -s ours am: 6910d448e5 -s ours

am skip reason: Change-Id I86eef7a93267f800dbfc8eafd307effa76a344ca with SHA-1 841195a103 is in history

Change-Id: Icff2a8f5a0ef5d3598cc7deb6e465b97a2c92f4e
tree: a02713025e69b8de6354fed91802b443f648442c
  1. service-t/
  2. tests/