Add Ethernet, TestNetworkSpecifier API am: 65949518fa am: cd075295ae

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I63159846579c43c721eeb86c9a55faa3f2888be8
tree: d1385c63c3bb2d995f034653f051c96bc17e0797
  1. core/
  2. services/