Merge "Quit handler threads at the end of the tests" into main am: 006f9d2998

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2812073

Change-Id: I9aeeff265b15b93aa3d423634ad8484906109a5a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>