Merge "Test tethered callback with TetheringInterface" into sc-dev am: fcda6f1131 am: eba760b272 am: bbd1ca5861

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

Change-Id: I2c9e9f4ddb30f07c14795fe841b9cf25110f9147