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

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

Change-Id: Ia96d3fa55a985e8a37c0e8b2b5893dce986b7898
tree: a02713025e69b8de6354fed91802b443f648442c
  1. service-t/
  2. tests/