[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: 45f05ccf -s ours

am skip reason: Merged-In I3bf3b7ddec7818c4fcf3ffaa0f97173d876d3642 with SHA-1 b46f8fae is already in history

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

Change-Id: I1fda48c8afc7cb66fdb51ccbae895c40938ffeee