Fix Installation Docs and example GS configuration

[aLekSer]

Now we have 6 pods in agones-system namespace, not one as per docs.
There was an issue in PortPolicy and image tag.

[agones-bot]

Build Succeeded 👏

Build Id: fb5e2b78-b248-4a67-97ae-27a9e1e17983

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:0.12.0-69ff85e
• image: gcr.io/agones-images/agones-sdk:0.12.0-69ff85e
• image: gcr.io/agones-images/agones-ping:0.12.0-69ff85e
• Linux C++ SDK (build): agonessdk-0.12.0-69ff85e-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.12.0-69ff85e.zip

A preview of the website (the last 30 builds are retained):

• https://69ff85e-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/962/head:pr_962 && git checkout pr_962
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.12.0-69ff85e

[roberthbailey]

According to https://agones.dev/site/docs/examples/ these aren't supposed to be working examples:

"These examples are for reference only. They are not backed by working images."

I'd be happy to make them workable, but if we do we should update the docs too (and make them all work).

[aLekSer]

@roberthbailey
Regarding the configuration, someone as I did could think they are working.
The most problem is that in comments section we read that Dynamic and HostPort could not defined at the same time. And then we define them both - which is mutually exclusive lines and bad configuration.
Note that I added fix of documentation here. PTAL again.

[aLekSer]

By the way I can leave not working image and correct only PortPolicy.

[agones-bot]

Build Succeeded 👏

Build Id: 9cdeded8-f151-4b7b-bfab-88de0646edd8

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:0.12.0-be782d1
• image: gcr.io/agones-images/agones-sdk:0.12.0-be782d1
• image: gcr.io/agones-images/agones-ping:0.12.0-be782d1
• Linux C++ SDK (build): agonessdk-0.12.0-be782d1-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.12.0-be782d1.zip

A preview of the website (the last 30 builds are retained):

• https://be782d1-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/962/head:pr_962 && git checkout pr_962
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.12.0-be782d1

[roberthbailey]

Regarding the configuration, someone as I did could think they are working.

I agree. I found it confusing as well.

[markmandel]

I've no strong opinions on leaving them as broken images - if you both feel strongly they should be working images, then lets make them all working configurations 👍 not just gameservers, but fleet.yaml, etc.

Sound good?

[roberthbailey]

I think it'd be nice to have them all working. It should be relatively easy to do so, and to update the docs to remove the note about them being non-functional.

[markmandel]

Sounds good to me. Do we want to include it in this PR, or make a new one?

[roberthbailey]

There isn't a good reason not to split it among multiple PRs so we can get this one in. I've created #969 with a checklist for the files in question (I think some of them are already ok, so we can just verify those and fix the others).

[markmandel]

Nice!

[roberthbailey]

Part of #969.

[agones-bot]

Build Succeeded 👏

Build Id: a4bab6ab-85f0-4f9a-be7a-7be4ef31ce34

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:0.12.0-74e1558
• image: gcr.io/agones-images/agones-sdk:0.12.0-74e1558
• image: gcr.io/agones-images/agones-ping:0.12.0-74e1558
• Linux C++ SDK (build): agonessdk-0.12.0-74e1558-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.12.0-74e1558.zip

A preview of the website (the last 30 builds are retained):

• https://74e1558-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/962/head:pr_962 && git checkout pr_962
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.12.0-74e1558