Merge "Remove unused testutils lib from tethering tests" am: 5fad8b26e0 am: b16646a949 am: a63fbe8200

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1433924

Change-Id: Ib7d695934eb69c8e49e690d3d85198cf6f7b9ff4