Add tests for gameServerCacheEntry in GameServerAllocation controller

[markmandel]

This moves the cache into its own file to make things a bit more readable, and also to implement some tests for the struct.

[markmandel]

/cc @ilkercelikyilmaz please let me know if you see any issues

[agones-bot]

Build Succeeded 👏

Build Id: 6fe17b85-cdcd-438a-9708-4455ec180e37

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-e6e2a99
• image: gcr.io/agones-images/agones-sdk:0.10.0-e6e2a99
• image: gcr.io/agones-images/agones-ping:0.10.0-e6e2a99
• Linux C++ SDK (build): agonessdk-0.10.0-e6e2a99-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.10.0-e6e2a99.zip

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

• https://e6e2a99-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/754/head:pr_754 && git checkout pr_754
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.10.0-e6e2a99

[cyriltovena]

LGTM

[agones-bot]

Build Failed 😱

Build Id: c3181411-7714-436a-83f0-89c829563581

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[agones-bot]

Build Succeeded 👏

Build Id: 298e70a3-1a89-448f-b041-f14d276e7304

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

• image: gcr.io/agones-images/agones-controller:0.10.0-0906f40
• image: gcr.io/agones-images/agones-sdk:0.10.0-0906f40
• image: gcr.io/agones-images/agones-ping:0.10.0-0906f40
• Linux C++ SDK (build): agonessdk-0.10.0-0906f40-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.10.0-0906f40.zip

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

• https://0906f40-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/754/head:pr_754 && git checkout pr_754
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.10.0-0906f40

[ilkercelikyilmaz]

/cc @ilkercelikyilmaz please let me know if you see any issues

Sure. I am going to run a load test and let you know if I see something unexpected

[markmandel]

Sweet - should be all the same - I just moved it to a new file, and added some unit tests. No logic changes.