Update kubeadm to 1.15

[jichenjc]

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1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

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[jichenjc]

kubectl get nodes --kubeconfig kubeconfigNAME STATUS ROLES AGE VERSION
openstack-master-pm4zm.novalocal Ready master 4m56s v1.15.0
openstack-node-qsbnb.novalocal Ready 33s v1.15.0

[hidekazuna]

Thanks, I tested this works. Could you update machine-deployment.yaml.template as well?

[chrigl]

@jichenjc could you also add 1.15 to the table in README.md

[sbueringer]

kubectl get nodes --kubeconfig kubeconfigNAME STATUS ROLES AGE VERSION
openstack-master-pm4zm.novalocal Ready master 4m56s v1.15.0
openstack-node-qsbnb.novalocal Ready 33s v1.15.0

I can also confirm that it just works with Kubernetes & kubeadm 1.15. It also works on my latest multi-node control plane branch.

[sbueringer]

@jichenjc Okay so only the change in machine-deployment.yaml.template is left until we can get this merged?

[jichenjc]

I will update the machine-deployment.yaml.template, forgot to update it :)

[jichenjc]

@hidekazuna @sbueringer updated the machine-deployment.template

[sbueringer]

/lgtm

Thx :)