Fix for CRD API docs generator

[aLekSer]

Fix CRD API docs generation process.
Leave only one expiryVersion and one publishVersion tag in the resulting doc.

[agones-bot]

Build Succeeded 👏

Build Id: 5e99d50d-e035-4eac-b65f-6cad9d7ae07e

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-f6688e2
• image: gcr.io/agones-images/agones-sdk:0.12.0-f6688e2
• image: gcr.io/agones-images/agones-ping:0.12.0-f6688e2
• Linux C++ SDK (build): agonessdk-0.12.0-f6688e2-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.12.0-f6688e2.zip

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

• https://f6688e2-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/877/head:pr_877 && git checkout pr_877
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.12.0-f6688e2

[aLekSer]

Wait a moment before merging, found one issue with awk.

[aLekSer]

Fixed an issue with title extracting. It is needed to have a blank line after the title part:

+++
title="Agones Kubernetes API"
description="Detailed list of Agones Custom Resource Definitions available"
+++

In order to check fast the work of merging part of the script I have commented out generation line and change base_version to 1.0 in Makefile. Also it is needed to change the comments parts of the go files. So that script will actually write new version to the html.
Proven that updates on new releases goes smoothly.

[aLekSer]

1. Algorithm will extract expiryVersion with future Release version say 1.0 (could be empty), publishVersion with any version as it exist in one instance.
2. All other expiryVersions would be ignored.
3. Then if something changes in output compared to the previous docs and if version was updated
   1. we mark the old publishVersion=0.12 part as expiryVersion with future Release version 1.0
   2. and all new generated docs goes to publishVersion as 1.0.
4. If version was not updated:
   1. get the old expiryVersion=1.0 and put as it was
   2. put new docs in publishVersion=1.0 and rewriting all previous contents of the same block
5. If nothing was changed - no output

[agones-bot]

Build Succeeded 👏

Build Id: 39073918-9512-46dd-bf94-9eb8e0d19edc

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

• image: gcr.io/agones-images/agones-controller:0.12.0-3c65906
• image: gcr.io/agones-images/agones-sdk:0.12.0-3c65906
• image: gcr.io/agones-images/agones-ping:0.12.0-3c65906
• Linux C++ SDK (build): agonessdk-0.12.0-3c65906-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.12.0-3c65906.zip

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

• https://3c65906-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/877/head:pr_877 && git checkout pr_877
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.12.0-3c65906

[agones-bot]

Build Succeeded 👏

Build Id: 1d0e1c6f-9986-4f9c-96ed-dd8e97163cf5

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

• image: gcr.io/agones-images/agones-controller:0.12.0-4c2d6a7
• image: gcr.io/agones-images/agones-sdk:0.12.0-4c2d6a7
• image: gcr.io/agones-images/agones-ping:0.12.0-4c2d6a7
• Linux C++ SDK (build): agonessdk-0.12.0-4c2d6a7-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.12.0-4c2d6a7.zip

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

• https://4c2d6a7-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/877/head:pr_877 && git checkout pr_877
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.12.0-4c2d6a7

[agones-bot]

Build Failed 😱

Build Id: 431a8e79-bd7f-43b8-b067-e0a807c8c300

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• Cloud Build log download

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[markmandel]

LGTM! 👍

[agones-bot]

Build Succeeded 👏

Build Id: 668f3592-7452-43b7-9e70-e3300a154f24

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-dd969d0
• image: gcr.io/agones-images/agones-sdk:0.12.0-dd969d0
• image: gcr.io/agones-images/agones-ping:0.12.0-dd969d0
• Linux C++ SDK (build): agonessdk-0.12.0-dd969d0-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.12.0-dd969d0.zip

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

• https://dd969d0-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/877/head:pr_877 && git checkout pr_877
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.12.0-dd969d0