Merge "Remove Tethering @TestApi" am: bd175573a5

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1460522

Change-Id: I3dcf776384d6c53876acaeb344820a88c19027da
tree: 1d36418b4e313a3ceccea68aeae736d0bbceab59
  1. Tethering/