Initial support for Kubernetes 1.12+

[outcoldman]

Fixes #3164

Support for k8s 1.12+, also keeping support for old versions of k8s.

See this comment for the list of incompatibilities with 1.12 #3164 (comment)

1. It uses kubeadm.k8s.io/v1alpha1 for kubeadm. Kubernetes 1.12 does not support version v1alpha1. Only v1alpha2. The recommended version is v1alpha3. I used kubeadm config upgrade ... to convert v1alpha1 to v1alpha1 and to v1alpha3.

2. This addon is not available /usr/bin/kubeadm alpha phase addon kube-dns, I guess it should use coredns instead (change in kubeadm to change kube-dns to coredns )

3. The argument cadvisor-port is not available in k8s-1.12

[k8s-ci-robot]

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[minikube-bot]

Can one of the admins verify this patch?

[dlorenc]

@minikube-bot OK to test

[outcoldman]

@dlorenc is it related to my change? or just a test issue? I can change back ‘1.10’ as default, that probably should keep all the test green.

[outcoldman]

@dlorenc I switched it back to 1.10.0 as default, that way the tests should work.

[outcoldman]

tests are still failing, is it me or some configuration issues?

[tamalsaha]

@outcoldman , please see #3132 (comment) comment. I am not sure if that is relevant.

[outcoldman]

@tamalsaha hard to tell, considering that I am using by default the same version as before, not sure how that can affect tests

[tstromberg]

@minikube-bot OK to test

[tstromberg]

How was this value arrived at?

[outcoldman]

I have used kubeadm config upgrade, cleared all the default values, just by accident left this one. I will remove it.

[tstromberg]

FYI: The remaining flakes appear to be due to #3163 - now resolved. There are other flakes, of course.

@minikube-bot OK to test

[AkihiroSuda]

Please update Docker to v18.06.1 for supporting ProcMount: kubernetes/kubernetes#64283 docker-archive/docker-ce@67fe100

[outcoldman]

@tstromberg update PR description and removed token generated by kubeadm config upgrade