commit 40c9fe116571919cc867c91106b1674d1508a84d
author Hungming Chen <nuccachen@google.com> Sun Nov 27 19:51:26 2022 +0800
committer Nucca Chen <nuccachen@google.com> Fri Dec 02 09:23:03 2022 +0000
tree 032cbd9fa984613040fdbcd4697dd302a96b0a07
parent fbef749cdae2b003f14646ac01bcbb1e7c084842

Test: separate common methods to EthernetTetheringTestBase

This is a preparation for breaking down EthernetTetheringTest into
CTS and MTS tests.

Changes:
1. Separate common methods from EthernetTetheringTest
   to EthernetTetheringTestBase.
Before:
  EthernetTetheringTest

After:
  [base class]                   [derived class]

  EthernetTetheringTestBase +--+ EthernetTetheringTest

2. No test operation is changed.

Bug: 250552545
Bug: 258637850
Test atest EthernetTetheringTest

Change-Id: I36d205bf6f2a8145d5ac63c620af7528765b22ab