Replace registry-creds addon ReplicationController with Deployment

[reegnz]

As the official k8s docs state:

Note: A Deployment that configures a ReplicaSet is now the recommended way to set up replication.

https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/

[k8s-ci-robot]

Hi @reegnz. 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?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: reegnz
To complete the pull request process, please assign tstromberg
You can assign the PR to them by writing /assign @tstromberg in a comment when ready.

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[codecov-io]

Codecov Report

Merging #5586 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5586   +/-   ##
=======================================
  Coverage   36.85%   36.85%           
=======================================
  Files         102      102           
  Lines        7354     7354           
=======================================
  Hits         2710     2710           
  Misses       4293     4293           
  Partials      351      351

[tstromberg]

@minikube-bot OK to test