Merge "Test TetheringManager could be GC after getting connector" am: 9d0c5419c9 am: 695b4c170e am: 5952e63014

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1838542

Change-Id: Icc44de4387b07bef3b4bc91d9eec33473a1fef2e