Fix querying Ethernet availability for unprivileged callers. am: ea4574dfd5 am: 4ff97e70da am: fa0acc822f am: c787dcdff8 am: 251480aa7c

Change-Id: I6482151348ef71c63babbcb42fac4c70e37df457
tree: 1f5baecf83c6d219b97fa71c75676df04ff9c80e
  1. service-t/
  2. tests/