Merge "Move network activity change processing to handler thread" am: df9a2d7e20

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2606673

Change-Id: I9d84525d3dfe33c45f13b1caa436baa8232942cb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>