WIP - aws: Disable the kubelet systemd unit during warm pool warming

[dezmodue]

As discussed yesterday during the kOps meeting - this patch makes sure that the kubelet systemd unit is not enabled by nodeup during the warming phase. This helps for use cases where a reboot is needed during the warming up phase and systemd would start the kubelet after reboot causing the node to join the cluster before the warming lifecycle is completed.

Ping @justinsb as requested

[k8s-ci-robot]

Hi @dezmodue. Thanks for your PR.

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[k8s-ci-robot]

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[hakman]

/ok-to-test

[hakman]

/test pull-kops-e2e-cni-amazonvpc
/test pull-kops-e2e-k8s-aws-amazonvpc

[hakman]

@dezmodue did you get a chance to test this on a test cluster with your setup?

[dezmodue]

@hakman we are about to test it - I will report back

[hakman]

@hakman we are about to test it - I will report back

If you want to use the build from this PR, you can look into the build log for KOPS_BASE_URL.
You just need to build the kops binary and export KOPS_BASE_URL=....
Clusters will be created with the binaries from KOPS_BASE_URL.

[hakman]

/retest