Add troubleshooting for allocation gRPC request

[pooneh-m]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind documentation

What this PR does / Why we need it:

Adding troubleshooting for allocation gRPC service, agones-allocator and some details on secrets for the service.
allocator-client.default is used in the example to simplify client setup for allocation.

Also adding troubleshooting for multicluster allocation.

Which issue(s) this PR fixes:

Closes #1866

Special notes for your reviewer:

[agones-bot]

Build Succeeded 👏

Build Id: bfdc5158-5db6-4d81-9a3b-0ab849992dc6

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

• image: gcr.io/agones-images/agones-controller:1.10.0-bd0868b
• image: gcr.io/agones-images/agones-sdk:1.10.0-bd0868b
• image: gcr.io/agones-images/agones-ping:1.10.0-bd0868b
• Linux C++ SDK (build): agonessdk-1.10.0-bd0868b-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.10.0-bd0868b.zip

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

• https://bd0868b-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1878/head:pr_1878 && git checkout pr_1878
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.10.0-bd0868b

[agones-bot]

Build Succeeded 👏

Build Id: ccfa6025-2efc-4768-8dc0-080244e0b162

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

• image: gcr.io/agones-images/agones-controller:1.10.0-121d9e9
• image: gcr.io/agones-images/agones-sdk:1.10.0-121d9e9
• image: gcr.io/agones-images/agones-ping:1.10.0-121d9e9
• Linux C++ SDK (build): agonessdk-1.10.0-121d9e9-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.10.0-121d9e9.zip

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

• https://121d9e9-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1878/head:pr_1878 && git checkout pr_1878
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.10.0-121d9e9

[markmandel]

This is great! I had some minor bash fixups, but this this'll be great to get in!

[agones-bot]

Build Succeeded 👏

Build Id: 49b363c1-8fa2-4295-a05a-2bab69b43c3a

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

• image: gcr.io/agones-images/agones-controller:1.10.0-534de5a
• image: gcr.io/agones-images/agones-sdk:1.10.0-534de5a
• image: gcr.io/agones-images/agones-ping:1.10.0-534de5a
• Linux C++ SDK (build): agonessdk-1.10.0-534de5a-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.10.0-534de5a.zip

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

• https://534de5a-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1878/head:pr_1878 && git checkout pr_1878
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.10.0-534de5a

[markmandel]

LGTM. @roberthbailey did you want to do a double check?

[agones-bot]

Build Failed 😱

Build Id: b5042836-b41f-4b34-b2ad-3d90013d4e8b

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[agones-bot]

Build Succeeded 👏

Build Id: 66a9647b-c569-481f-8ce4-0c4eedbf6d5c

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

• image: gcr.io/agones-images/agones-controller:1.10.0-10351f4
• image: gcr.io/agones-images/agones-sdk:1.10.0-10351f4
• image: gcr.io/agones-images/agones-ping:1.10.0-10351f4
• Linux C++ SDK (build): agonessdk-1.10.0-10351f4-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.10.0-10351f4.zip

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

• https://10351f4-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1878/head:pr_1878 && git checkout pr_1878
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.10.0-10351f4

[agones-bot]

Build Succeeded 👏

Build Id: 4dc44769-f788-4f76-b930-d629408f3c75

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

• image: gcr.io/agones-images/agones-controller:1.10.0-115ffd9
• image: gcr.io/agones-images/agones-sdk:1.10.0-115ffd9
• image: gcr.io/agones-images/agones-ping:1.10.0-115ffd9
• Linux C++ SDK (build): agonessdk-1.10.0-115ffd9-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.10.0-115ffd9.zip

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

• https://115ffd9-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1878/head:pr_1878 && git checkout pr_1878
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.10.0-115ffd9

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pooneh-m, roberthbailey

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[agones-bot]

Build Succeeded 👏

Build Id: 55ac3660-8426-405d-8175-0babcf2e0d6a

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

• image: gcr.io/agones-images/agones-controller:1.10.0-da5ce24
• image: gcr.io/agones-images/agones-sdk:1.10.0-da5ce24
• image: gcr.io/agones-images/agones-ping:1.10.0-da5ce24
• Linux C++ SDK (build): agonessdk-1.10.0-da5ce24-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.10.0-da5ce24.zip

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

• https://da5ce24-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1878/head:pr_1878 && git checkout pr_1878
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.10.0-da5ce24