VPN: Hook up the new control protocol and network state.

1. No more End-Of-Arguments.
2. Daemons close the control socket after they are initialized.
3. No more system properties.
4. ip-up-vpn now creates state to pass the configuration.
5. JNI methods are split again for legacy VPN.

Change-Id: I02fafdf01d425c965345ef712b2bd5fdee3a0cab