Revert "Revert "EthernetTetheringTest: add testTetherClatUdp""

This reverts commit 5bbd292bedc0fa922d99421668c803d2f5b07598.

Bug: 215655463
Change-Id: I06490001b06446b6a4ff3dc084ce11e8ebbe17f8
Test: atest ConnectivityCoverageTests
2 files changed