Revert "Always disconnect agents immediately." am: 2a2b911a31

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/23827541

Change-Id: Iffd10aef83042ce295704b83063ef4e796656253
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>