Fix querying Ethernet availability for unprivileged callers. am: e6f49eda89 am: aafdde338e am: e710eabef1

Change-Id: Iafb673e949d06a327327d2ff043d8929a35974fa
tree: 497098f83761ff7aaa565fc8e6207dd2ee411dc4
  1. service-t/
  2. tests/