Fix DNS configuration when using resolvconf_mode='host_resolvconf' during scale

[unai-ttxu]

What type of PR is this?

/kind bug

What this PR does / why we need it:

When resolvconf_mode is set to host_resolvconf, kubernetes/preinstall role should be included after k8s installation. Both cluster.yml and upgrade-cluster.yml include the role but scale.yml playbook doesn't.

That would cause that new nodes won't be properly configured to use coredns or nodelocaldns in their dns configuration.

Special notes for your reviewer:

I haven't openned an issue. If you consider it neccesary I will be gladed to open it.

Does this PR introduce a user-facing change?:

Fix DNS configuration when using resolvconf_mode='host_resolvconf' during scale

[k8s-ci-robot]

Hi @unai-ttxu. Thanks for your PR.

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[cristicalin]

thanks for this fix @unai-ttxu !

/ok-to-test
/lgtm

[floryut]

@unai-ttxu Great 👍

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, unai-ttxu

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