Merge "[Tethering] Add MTS method to TetheringManagerTest." am: 9424810659

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2046446

Change-Id: Ib76adfadd76629a197a44347e9e84c67439f8056
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>