feat: Small tvalv2

[NemoDacremont]

Added :

• make (c|r|cp)tval_v2send
• make (c|r|cp)tval_v2recv

They enable unit testing sending data and receiving data through TCP with our driver.

[Catatomik]

Well, still unable to test receive without begin able to send : opening a TCP connection needs a handshake
=> Must be able to acknowledge packets from within QEMU without sending any data back (even IP through ARP response)
So we can't send any IP packet (only ARP requests will be received)

=> Just send some ARP requests, and check that ARP responses are being treated and sent

[Leikoe]

yolo