Merge "EthernetTetheringTest: test RFC 7050 prefix64 discovery" am: 7376fe0714

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2435314

Change-Id: I0d9fc1a20bb8db4a64e7d1bf1939c0ce3791307f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>