[FUI03] No-op refactoring of VpnInfo
As a preparation of exposing system API. This patch does some harmless refactoring, which includes: 1. Move VpnInfo to android.net 2. Add nullability annotations 3. Make members final Bug: 174123988 Test: TH Change-Id: I1530bb45d0e84c28c6deac33596bc686058afc0d
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