[automerger skipped] Clean up DnsTlsDispatcher when a network is disconnected...

[automerger skipped] Clean up DnsTlsDispatcher when a network is disconnected am: b46f8fae am: 70a21cad -s ours

am skip reason: Merged-In I3bf3b7ddec7818c4fcf3ffaa0f97173d876d3642 with SHA-1 e0086c0f is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/14997551

Change-Id: Idafebcb0a39195f201d481b9a039da605139285b