Add Ethernet, TestNetworkSpecifier API am: 65949518fa

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1574300

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I1a1b38fb6b8b6831bac016a8352ae9073758f9af
tree: d1385c63c3bb2d995f034653f051c96bc17e0797
  1. core/
  2. services/