Use TAP interface directly, without promiscuous mode

* This removes gopacket dependency
* However adds water-library small one

Signed-off-by: Sergey Matveev <stargrave@stargrave.org>
Fix nounces incrementing

That bug leads to reusing the same nonce.

Signed-off-by: Sergey Matveev <stargrave@stargrave.org>