Merge "Migrate Tethering util functions to CtsTetheringUtils" am: cea075213c

Original change: https://android-review.googlesource.com/c/platform/cts/+/1460711

Change-Id: I4f8e1e0554c5c1b6cf6cdc306920cd93d32c7d68
tree: 792ebf5fc6b482e79bfaca0747e24a9e1a6cd84c
  1. tests/