More addons

[nitrocode]

what

• Test all recommended addons coredns, kube-proxy, and vpc-cni

why

• It's possible additional changes may need to be made to support these addons
  We may need to add a depends_on to the eks addons resource to depend on the node group workers

references

• Previous PR Manage aws_eks_addon resources #125
• aws_eks_addon creation race condition hashicorp/terraform-provider-aws#20404

[nitrocode]

/test all

[z0rc]

@nitrocode the code looks correct. Though I'm not sure whether I'll be using this feature. For now I prefer to have a declarative depends_on = [aws_eks_node_group.workers] in addon resource rather than waiting arbitrary time.

Also hashicorp/terraform-provider-aws#20562. Which might make waiting in tf code unnecessary, as aws provider will be able to wait by itself.