Revert "EthernetTetheringTest: add testTetherClatUdp"

This reverts commit b0274cf796ff76ec799aab58c62a8caff307bec1.

Reason for revert: Breaks presubmit: b/234727688

Change-Id: I736752dca3707588a525f28d208bdb20f7280972
2 files changed