Add Docker 18.06.1 for CentOS and RHEL 7

[bcorijn]

Similar to #5758 and targetting issue #5747, adding a possibility of running Docker 18.06.1 on CentOS, Amazon Linux 2 and RHEL.

[k8s-ci-robot]

Hi @bcorijn. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[mikesplain]

Thanks so much @bcorijn!

/ok-to-test

[mikesplain]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bcorijn, mikesplain

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