Fix querying Ethernet availability for unprivileged callers. am: dd397f58c7 am: 4ff97e70da am: 6b41e255c6

Change-Id: Ib4491ccd852bdb0fa8ad93e031239714239c1a4a
tree: 1f5baecf83c6d219b97fa71c75676df04ff9c80e
  1. service-t/
  2. tests/