Merge "Remove unused testutils lib from tethering tests" am: 5fad8b26e0 am: b16646a949 am: a63fbe8200 am: 2b79bd6e27

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

Change-Id: I6f7ded717faf6e801102e37863ff9477dde47c8a