Add pod tolerations, nodeSelector and affinity in helm

[cyriltovena]

This adds pod tolerations, nodeSelector and affinity for Agones Controller and ping service as parameter variables for our helm chart.

Closes #407

FYI: I'm also adding resource limits/requests for ping service.

[agones-bot]

Build Succeeded 👏

Build Id: 329c5540-491e-42bf-810e-806d359fbf1a

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

• image: gcr.io/agones-images/agones-controller:0.7.0-592aed9
• image: gcr.io/agones-images/agones-sdk:0.7.0-592aed9
• image: gcr.io/agones-images/agones-ping:0.7.0-592aed9
• Linux C++ SDK (build: dev): agonessdk-0.7.0-592aed9-dev-linux-arch_64.tar.gz
• Linux C++ SDK (build: runtime): agonessdk-0.7.0-592aed9-runtime-linux-arch_64.tar.gz
• Linux C++ SDK (source): agonessdk-0.7.0-592aed9-src.zip
• SDK Server: agonessdk-server-0.7.0-592aed9.zip

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/473/head:pr_473 && git checkout pr_473
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.7.0-592aed9

[agones-bot]

Build Succeeded 👏

Build Id: 5f039e53-6b9a-457a-b5bd-f52733f2a4ec

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

• image: gcr.io/agones-images/agones-controller:0.8.0-51e2f5e
• image: gcr.io/agones-images/agones-sdk:0.8.0-51e2f5e
• image: gcr.io/agones-images/agones-ping:0.8.0-51e2f5e
• Linux C++ SDK (build: dev): agonessdk-0.8.0-51e2f5e-dev-linux-arch_64.tar.gz
• Linux C++ SDK (build: runtime): agonessdk-0.8.0-51e2f5e-runtime-linux-arch_64.tar.gz
• Linux C++ SDK (source): agonessdk-0.8.0-51e2f5e-src.zip
• SDK Server: agonessdk-server-0.8.0-51e2f5e.zip

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/473/head:pr_473 && git checkout pr_473
• helm install install/helm/agones --namespace agones-system --name agones --set agones.image.tag=0.8.0-51e2f5e