Merge "Add and implement API for VpnManagers to request validation" am: 4b66d4e244 am: 7a32b1df4a am: dd2b99832d

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

Change-Id: I2faabc2c0bb474c8174a17911671bb5223a52286