Merge "Add test for downstream tethering" into main am: dba0dbc7ec am: 3a3392147d

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2606668

Change-Id: Ic1b1a6d3f99d782a90357181f4180b01ab300360
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>