internal/envoy/v3: RouteConfiguration ignores port when choosing virtualhost #5437
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Previously we stripped the port from the Host header when matching a virtualhost, which also resulted in the header being modified for the downstream. For Gateway API conformance, we no longer want to do this.
This basically reverts #3458 and uses the newer RouteConfiguration field that allows us to ignore port when choosing a virtualhost. We reintroduce the logic in the SNI/Host misdirected request Lua to strip the port when checking the hostname against SNI.