Remove dependency to util/runtime from APIS package

[pooneh-m]

pkg/apis has an unnecessary dependency to pkg/util/runtime.
Removed the dependency to avoid needing to pull runtime imports just to reference apis package externally.

[agones-bot]

Build Failed 😱

Build Id: 0408080c-a573-4395-b099-5969052be82e

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[agones-bot]

Build Succeeded 👏

Build Id: f10b8cb9-8a6d-4911-850f-724b4bd76ff9

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-e99cd34
• image: gcr.io/agones-images/agones-sdk:0.10.0-e99cd34
• image: gcr.io/agones-images/agones-ping:0.10.0-e99cd34
• Linux C++ SDK (build): agonessdk-0.10.0-e99cd34-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.10.0-e99cd34.zip

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

• https://e99cd34-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/697/head:pr_697 && git checkout pr_697
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.10.0-e99cd34

[agones-bot]

Build Succeeded 👏

Build Id: f10b8cb9-8a6d-4911-850f-724b4bd76ff9

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-e99cd34
• image: gcr.io/agones-images/agones-sdk:0.10.0-e99cd34
• image: gcr.io/agones-images/agones-ping:0.10.0-e99cd34
• Linux C++ SDK (build): agonessdk-0.10.0-e99cd34-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.10.0-e99cd34.zip

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

• https://e99cd34-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/697/head:pr_697 && git checkout pr_697
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.10.0-e99cd34

[agones-bot]

Build Succeeded 👏

Build Id: f10b8cb9-8a6d-4911-850f-724b4bd76ff9

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-e99cd34
• image: gcr.io/agones-images/agones-sdk:0.10.0-e99cd34
• image: gcr.io/agones-images/agones-ping:0.10.0-e99cd34
• Linux C++ SDK (build): agonessdk-0.10.0-e99cd34-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-0.10.0-e99cd34.zip

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

• https://e99cd34-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/697/head:pr_697 && git checkout pr_697
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.10.0-e99cd34