Merge "Test tethered callback with TetheringInterface" into sc-dev am: fcda6f1131 am: 6189804a78

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/14622456

Change-Id: Ifc41171106cdd6c62ab9c8dd8998c4c6c913e267