VPN: set IFF_NO_PI on TUN interface.
Packet info header (struct tun_pi) was required to support IPv6 in kernel prior to 2.6.26. Setting IFF_NO_PI will remove the header from the packets sent/recieved via TUN file descriptor, so now they are just raw IP packets. Change-Id: I0b4ae9db23d3bc10995a00eb053527b499ad6eb6
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