Merge "Add and implement API for VpnManagers to request validation" am: 4b66d4e244 am: 7a32b1df4a

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

Change-Id: Ibd629aeafd28281ca1ba09fb789a3c43be6f7f74