Prototype of manual parser creation from multiple packet filter queries (w/o enablement knobs)

[r12f]

Merge protocol into a single parser in P4:

• Multiple protocols: TCP / UDP / RDMA over RoCEv2
• Multiple Tunnels: VxLan with multiple id, and each id is assigned to a customer.

Here are some sample of Zion policies:

Eth({ether_type = ETH_IPV4}).IPv4({ dst_ip = lpm })
Eth({ether_type = ETH_MY_TUNNEL}).MyTunnel({proto_id = ETH_IPV4, dst_id = exact}).IPv4