Merge "Add and implement API for VpnManagers to request validation" am: 4b66d4e244 am: 1fdf2c9664

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1962981

Change-Id: I3874eb63a706c405232b10862d3bb14bbd2f89f9