Reworked tutorial for Azure Private DNS

[saidst]

First use showed the tutorial for Azure DNS & Azure Private DNS to be not practically usable for all users.
In particular, it required some special knowledge about the required configuration of the employeed nginx-ingress-controller.

This PR refines the tutorial to make endusers be able to work through it completely.

[saidst]

FYI @timja

[timja]

Looks fine, I don’t remember having to do this but I tested it on minikube, it’s probably on by default there.

I’ve had to enable this when using traefik before

[dstampfli]

This looks good to me as well. Sorry for the slow response and thanks for doing the update. This is mentioned in the tutorial but I wanted to point out explicitly that when controller.publishService.enabled=true is set on the ingress controller a describe of the ingress resource will show the IP of the load balancer in the address column as shown below. This does not happen (field is blank) is that parameter is not set.

NAME   HOSTS                             ADDRESS             PORTS   AGE
nginx1   sample1.aksdemos.com   52.167.189.120   80      6d22h
nginx2   sample2.aksdemos.com   52.167.189.120   80      6d21h

[saidst]

Would you recommend...

1. to describe the observations one can make in case the parameter is not set properly?
2. to contain a sample output of the describe command when the parameter has been set correctly?

I tend to go for 2).

[dstampfli]

Agree that #2 is best.

[saidst]

Thanks Dave. Updated the doc accordingly.

[saidst]

Also thanks @timja for checking this out. I remove WIP now.

[saidst]

/assign @njuettner

Would you help again by reviewing and merging?

Thanks.

[Raffo]

@saidst I just have one trivial suggestion, the other parts are good to go. Ping me once you fixed that and we can merge it.

[Raffo]

/approve
/lgtm

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