Canal v3.3.0 for Kubernetes v1.12+

[KashifSaadat]

Changes:

• Added manifest for Canal v3.3.0: https://docs.projectcalico.org/v3.3/releases#v3.3.0
• Kubernetes version constraint to v1.12+: "Kubernetes 1.12 includes alpha Stream Control Transmission Protocol (SCTP) support. Calico v3.3 supports SCTP in Kubernetes network policies."
• Set priorityClassName to system-node-critical, as the previous critical-pod annotation is deprecated and will soon be removed: https://kubernetes.io/docs/tasks/administer-cluster/guaranteed-scheduling-critical-addon-pods/

[KashifSaadat]

Notes:

• The PodPriority Class system-node-critical already exists and so has been reused for the Canal DS Spec.
• Pod Priority & Preemption is enabled by default from Kubernetes v1.11 and onwards. If it's disabled then the field seems to get ignored and dropped from the manifest.

https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/

[KashifSaadat]

I'm gonna do some more testing on this first, will update when completed.

[KashifSaadat]

/retest

[KashifSaadat]

Tested and appears to have applied fine, when the pods are scheduled their spec includes:

  priority: 2000001000
  priorityClassName: system-node-critical

Removing the WIP tag, ready for review. :)

[gambol99]

/lgtm

[k8s-ci-robot]

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[KashifSaadat]

/test pull-kops-e2e-kubernetes-aws