Merge "Add tethering privileged test" am: c6cab2d5e8 am: 54c4148f8f am: 7b26300c42

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1345361

Change-Id: I46e6a1514c9518ab1f308f129c27d53002793a32