Map docker 1.13.1 & 17.03.1, default 1.8 to 1.13.1

[justinsb]

Kubernetes 1.8 adds validation for 1.13.1 and 17.03.1 (17.03.1 being
essentially the same as 1.13.1).

For 1.8, the default should be 1.13.1

[chrislovecnm]

/lgtm

[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[johanneswuerbach]

According to https://github.com/kubernetes/features/blob/master/release-1.8/release-notes-draft.md#external-dependencies k8s was tested against 17.03.2, which seems to have some fixes on top of 1.13.1.

https://github.com/moby/moby/blob/1.13.x/CHANGELOG.md
https://github.com/moby/moby/blob/17.03.x/CHANGELOG.md#17032-ce-2017-05-29

Maybe a better default?

[chrislovecnm]

Pending some questions about the rev

[chrislovecnm]

/lgtm

[justinsb]

Going to remove LGTM, I'm actually not sure whether we should default to 1.13 or 17.03. I think GCE is going to stick with the COS image that has 1.13. Unsure what GKE is going to do.

[chrislovecnm]

@dchen1107 any recommendations?

[chrislovecnm]

/retest

[justinsb]

Default should be 1.13.1 for 1.8; updated PR

[chrislovecnm]

/lgtm

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[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-github-robot]

Automatic merge from submit-queue.