Register registry-proxy.yaml.tmpl with registry addons

[kumarom]

Related to #4341

[k8s-ci-robot]

Hi @kumarom. 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.

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[minikube-bot]

Can one of the admins verify this patch?

[tstromberg]

/approve /lgtm

Thank you!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kumarom, tstromberg

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[medyagh]

@minikube-bot OK to test

[medyagh]

we need documentation for this great feature, we could have added as second option under this, (the documentation could be done in a separate PR)

https://github.com/kubernetes/minikube/blob/master/docs/reusing_the_docker_daemon.md

[medyagh]

Failing test is related to #4495

looks good to me