Merge "Test TetheringManager could be GC after getting connector" am: 9d0c5419c9 am: 695b4c170e am: 6ae4b7e227

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

Change-Id: I51d1ff8d9bbc7bccaf599b5a53639c7203a0ca5a