Complete FreeBSD support, also fix 'tun' device for it.#2

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mmokhi wants to merge 4 commits intoLaKabane:masterfrom

Commits on Oct 30, 2016

Merge pull request #1 from LaKabane/master
mmokhi
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Commits on Oct 31, 2016

Fix 'tun' device for 'FreeBSD' also and support it completely (tests show)
mmokhi
committed
Fix 'tun' device for 'FreeBSD' also and support it completely (tests show)
mmokhi
committed

Commits on Nov 3, 2016

Fix an error point about ipv6, better compatiblity on platforms
mmokhi
committed