Merge "Test tethered callback with TetheringInterface" into sc-dev am: fcda6f1131 am: eba760b272

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

Change-Id: Idf8eeedc05d3b936ae76c94cb49e9691a5ce505b