Set default Kubernetes version to v1.13.1 (latest stable)

[tstromberg]

No description provided.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tstromberg

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [tstromberg]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[afbjorklund]

Do you need a new cri-o too, for this ? The current minikube version of cri-o is for 1.11 ?

https://github.com/kubernetes-sigs/cri-o#compatibility-matrix-cri-o---kubernetes-clusters

[tstromberg]

Do you need a new cri-o too, for this ? The current minikube version of cri-o is for 1.11 ?

https://github.com/kubernetes-sigs/cri-o#compatibility-matrix-cri-o---kubernetes-clusters

Interesting. I hadn't realized this version dependency. I'll see about updating it, but only if the newer cri-o is backwards compatible with v1.11. It seems like we may have to stop bundling cri-o in the image and/or bundle multiple versions and keep them in sync that way.

[tstromberg]

@afbjorklund - Made crio update a separate PR, since this PR is intended only to change the default:
#3515