Improve IPLB1 offer to fit http3

[matmicro]

As an IPLB1 user, i would like to be able to allow http3 usage.

Http3 (quic) is based on UDP 443.

Crurent iplb1 offer is limited to 2 frontend, which allows to use TCP 80 and TCP 443. Current limitation to 2 frontend is not enough.

As in convenient usage we would like to use IPLB1 with 2 floating IPs, this means we need 4 frontend to at least create rules for TCP and UDP.

[matmicro]

Furthermore, even if using only 2 frontends, it does not work :

• frontend 1: TCP 80,443
• frontend 2: UDP 443

Even if backend are well managing HTTP3 (quic) usage, this does not work if we go through an IPLB1. I was not able to find the root cause.