Enable Tun.ko

Change-Id: Iee29e86841f07b28f4cc58b71b0d7e97e5181051
Build TUN into kernel

Seems that OpenVPN doesn't work with tun.ko module on 4.4.2.

Change-Id: I665316c13057df03d8f626d050b3abfffde7b3c9
TUN for thunderc

Change-Id: Icf01a7f07d17dcf8ed2c38d48b3c6579919ba316