[automerger skipped] Merge "Migrate Tethering util functions to CtsTetheringUtils" into mainline-prod am: 8a95dabff4 -s ours
am skip reason: Change-Id I59d529cb50b4b6cdafc6be78ad61a55ee1be0404 with SHA-1 2888ab7bc7 is in history
Original change: https://googleplex-android-review.googlesource.com/c/platform/cts/+/12862738
Change-Id: I73d4e5bc72c01566fc515b0e1876a401ba16262d
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