✨ Forward-port modifies DockerMachine condition status to report for control plane to be ready

[Evalle]

What this PR does / why we need it:
Adds DockerMachine condition to report for the cluster control plane to be ready

Which issue(s) this PR fixes
Fixes #3859

[k8s-ci-robot]

Hi @Evalle. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[Evalle]

FYI @fabriziopandini

[arghya88]

/ok-to-test

[fabriziopandini]

Thanks @Evalle!
/lgtm

[Evalle]

/retest

[fabriziopandini]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

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