This reverts commit d73f960aab.
Problems with deadlocking arises due to orphaned packets in per-peer
queues. Additional work on this issue continues in seperate branch.
This change was needed for the Linux TUN status hack
to work properly (not increment the error counter).
This commit also updates the TUN interface to allow for
the construction / removal of the TUN info headers in-place.
And outbound routing
I am not entirely convinced the use of net.IP is a good idea,
since the internal representation of net.IP is a byte slice
and all constructor functions in "net" return 16 byte slices
(padded for IPv4), while the use in this project uses 4 byte slices.
Which may be confusing.