v1.18.0-alpha.0

Changelog since v1.2.1:

• Bump k8s.io/kubernetes depedency to v1.18.6
  • adds new zone/region topology labels topology.kubernetes.io/zone and topology.kubernetes.io/region.
  • adds new instance type labels node.kubernetes.io/instance-type.
• Enable dual-stack node addresses behind an alpha feature gate ENABLE_ALPHA_DUAL_STACK

Supports Kubernetes clusters on v1.18.X