Merge "Have a method to stop VPN and send event to VPN app" am: 4e08dae7d2 am: e3325d736a am: e07cecf636 am: b27ed69b64

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2194337

Change-Id: Ie2d7cac9e05febb45a59c4079ba3e88b7c5309d7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>