feat: enable ipv6 for internal-router

[rbarabas]

Enables IPv6 on internal-router.

Previously, on dual stacked Kubernetes deployments internal-router would fail to start because nginx would only listen to IPv4 addresses and not IPv6. This change makes the server also listen on IPv6.

❯ kgp internal-router-6997b5f9d5-9dmpg -o wide
NAME                               READY   STATUS    RESTARTS   AGE   IP                 NODE                                                   NOMINATED NODE   READINESS GATES
internal-router-6997b5f9d5-9dmpg   1/1     Running   0          8d    2001:cafe:41::15   6e82d2e3aed918.vm.dev-k3s-cluster-sjc-01-cp.internal   <none>           <none>

❯ kgcm internal-router-config -o yaml| egrep '^[ ]+listen'
      listen 80 default_server;
      listen [::]:80 default_server;

[yaroslav-codefresh]

/e2e

[yaroslav-codefresh]

@rbarabas I have run e2e, approved and merged. This change will be available in the next runtime release 0.1.34 according to our release management policy.