Fix TCPKeepAlive config for TCPRoute

[arkodg]

          The TCP keep-alive setting is specified in the IR, resulting in a keep-alive configuration for the TCP listener cluster. Typically, such settings are adjusted through a traffic policy, i'm not certain if this make sense in this context.

- name: "fourth-listener"
  address: "0.0.0.0"
  tcpKeepalive:
    probes: 10
  port: 10083
  destination:
    name: "tcp-route-dest"
    settings:
    - endpoints:
      - host: "1.2.3.4"
        port: 50000

Originally posted by @alexwo in https://github.com/envoyproxy/gateway/pull/3004#discussion_r1538927285

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[arkodg]

cc @aoledk has this been fixed ?

[aoledk]

@arkodg this has been fixed already.

[arkodg]

thanks for confirming @aoledk !