Implementing cluster selector from multi-cluster allocation policies.

[pooneh-m]

The cluster selector logic is implemented as an iterator on allocation policies.
This is to implement multi-cluster allocation as explained in #597

[agones-bot]

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Build Succeeded 👏

Build Id: 616ac71e-130b-41f8-b6df-bbba4263b001

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

• image: gcr.io/agones-images/agones-controller:0.10.0-0a8003d
• image: gcr.io/agones-images/agones-sdk:0.10.0-0a8003d
• image: gcr.io/agones-images/agones-ping:0.10.0-0a8003d
• Linux C++ SDK (build): agonessdk-0.10.0-0a8003d-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.10.0-0a8003d.zip

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• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.10.0-0a8003d

[markmandel]

All the comments are about idiomatic Go type things, but otherwise, look good!

(You break down PR's into way smaller chunks than I do 👍 I should learn from you)

[markmandel]

/cc @broady to tell me if I'm wrong in my opinions of Go naming (which I may be!) 😄

[agones-bot]

Build Succeeded 👏

Build Id: 3027383f-443a-4cc8-9502-fbf9cab1b007

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

• image: gcr.io/agones-images/agones-controller:0.10.0-26fc672
• image: gcr.io/agones-images/agones-sdk:0.10.0-26fc672
• image: gcr.io/agones-images/agones-ping:0.10.0-26fc672
• Linux C++ SDK (build): agonessdk-0.10.0-26fc672-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.10.0-26fc672.zip

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

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To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/733/head:pr_733 && git checkout pr_733
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.10.0-26fc672

[agones-bot]

Build Succeeded 👏

Build Id: bb9e9c67-2587-4229-bd0b-282d034c41b4

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

• image: gcr.io/agones-images/agones-controller:0.10.0-669d0f2
• image: gcr.io/agones-images/agones-sdk:0.10.0-669d0f2
• image: gcr.io/agones-images/agones-ping:0.10.0-669d0f2
• Linux C++ SDK (build): agonessdk-0.10.0-669d0f2-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.10.0-669d0f2.zip

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

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To install this version:

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• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.10.0-669d0f2

[markmandel]

🐱 Awesome.

[agones-bot]

Build Failed 😱

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Build Succeeded 👏

Build Id: e3063205-ca6c-4345-9b16-63ad2703acd9

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

• image: gcr.io/agones-images/agones-controller:0.10.0-ae8c072
• image: gcr.io/agones-images/agones-sdk:0.10.0-ae8c072
• image: gcr.io/agones-images/agones-ping:0.10.0-ae8c072
• Linux C++ SDK (build): agonessdk-0.10.0-ae8c072-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.10.0-ae8c072.zip

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

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To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/733/head:pr_733 && git checkout pr_733
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.10.0-ae8c072