This commit verifies the lock down related flows: - When a user present - When lock down is reset - Create LockdownVpnTracker - isVpnLockdownEnabled(int) - getVpnLockdownAllowlist(int) Bug: 230548427 Test: atest VpnManagerServiceTest Change-Id: Ic42d884b64d2c7ec0caf9dff95d94fc5e52456b2