Merge "Test TetheringManager could be GC after getting connector" am: 9d0c5419c9 am: 695b4c170e am: 6ae4b7e227 am: 4123670bf5 am: 464ecc1ae4

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

Change-Id: I056a70f43af40ef04f38c34e67861564a6f08ed8