Fix registry addon ReplicationController template

[zregvart]

Running the minikube addons enable registry yields registry was successfully enabled but no registry Pod ends up being run.

I've narrowed it down to this env entry not being quoted.

Logs from kube-addon-manager-minikube Pod show this error:

Error from server (BadRequest): error when creating "/etc/kubernetes/addons/registry-rc.yaml": ReplicationController in version "v1" cannot be handled as a ReplicationController: v1.ReplicationController.Spec: v1.ReplicationControllerSpec.Template: v1.PodTemplateSpec.Spec: v1.PodSpec.Containers: []v1.Container: v1.Container.Env: []v1.EnvVar: v1.EnvVar.Value: ReadString: expects " or n, but found t, error found in #10 byte of ...|,"value":true}],"ima|..., bigger context ...|"name":"REGISTRY_STORAGE_DELETE_ENABLED","value":true}],"image":"registry.hub.docker.com/library/reg|...

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[k8s-ci-robot]

Hi @zregvart. 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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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: zregvart
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We suggest the following additional approver: afbjorklund

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[minikube-bot]

Can one of the admins verify this patch?

[tstromberg]

@minikube-bot OK to test