Release 1.18.0-rc

[roberthbailey]

This includes all of the changes for the 1.18.0 release candidate.

[agones-bot]

Build Succeeded 👏

Build Id: c910107f-142a-46db-a0cc-c2c089d268fb

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

• image: gcr.io/agones-images/agones-controller:1.18.0-ba27c8a
• image: gcr.io/agones-images/agones-ping:1.18.0-ba27c8a
• Linux C++ SDK (build): agonessdk-1.18.0-ba27c8a-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.18.0-ba27c8a.zip

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

• https://ba27c8a-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2292/head:pr_2292 && git checkout pr_2292
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.18.0-ba27c8a

[markmandel]

Suggested change

	This release fixes a gRPC compatibility issue in the allocator service introduced in Agones 1.11.0. If you have a gRPC client that does not work with the allocator server, you can now disable the REST server for better client compatibility.
	This release fixes a gRPC compatibility issue in the allocator service introduced in Agones 1.11.0. If you have a gRPC client that does not work with the allocator server, you can now disable the REST server, or set it to a different port for better client compatibility.

Both are true, right?

[roberthbailey]

Yes, both are true.

[roberthbailey]

Done.

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: markmandel, roberthbailey

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [markmandel,roberthbailey]

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[agones-bot]

Build Succeeded 👏

Build Id: b82919fe-429c-4405-af14-3f877abcd793

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

• image: gcr.io/agones-images/agones-controller:1.18.0-b4e1710
• image: gcr.io/agones-images/agones-ping:1.18.0-b4e1710
• Linux C++ SDK (build): agonessdk-1.18.0-b4e1710-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.18.0-b4e1710.zip

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

• https://b4e1710-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2292/head:pr_2292 && git checkout pr_2292
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.18.0-b4e1710