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

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

Change-Id: I251696b855e7f971ac740eb70fa86a4158f15c58
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>