Use real domain names in jx-prod and jx-preprod (GCP)

Description

Update DNS records and names for the various exposed services inside jenkins X.

Technical Aspect

Connect to the wanted jx cluster : (ie: gcloud container clusters get-credentials jx-prod --zone us-east1-b --project jx-preprod).
Execute the following to get the LoadBalancer IP address:

kubectl get svc jxing-nginx-ingress-controller -n default -o'jsonpath={ .status.loadBalancer.ingress[0].ip }' 

Note that in our jx-prod cluster, we have set the Ingress in the default namespace vs the jx default one :kube-system namespace.

Go to gcloud dashboard, create a DNS zone for the domain wished (ie: platform.dev.nuxeo.com). Copy the associated nameservers.
Inside this zone, create the A records (ie: jenkins.platform.dev.nuxeo.com) pointing to the LoadBalancer IP address.

Go to aws route53, create a NS DNS record for the domain wished (ie : platform.dev.nuxeo.com), paste the copied nameservers. 

Connect to the jx cluster, do kubectl get ingress --namespace=<the namespace> -o yaml
Edit the host part and set it to the domain name.
 

Examples of A records:

jenkins.platform.dev.nuxeo.com
nexus.platform.dev.nuxeo.com
docker-registry.platform.dev.nuxeo.com
chartmuseum.platform.dev.nuxeo.com