Add new-pod-scale-up-delay in Cluster Autoscaler spec

[akshedu]

Allow specifying newPodScaleUpDelay in cluster autoscaler spec which cases autoscaler to ignore unscheduled pods for the given interval

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[olemarkus]

You perhaps want to make use of this variable in the CAS template as well?
upup/models/cloudup/resources/addons/cluster-autoscaler.addons.k8s.io/k8s-1.15.yaml.template

[olemarkus]

/ok-to-test

[akshedu]

/assign @hakman

[hakman]

Thanks @akshedu. Looks good from my point of view.
@olemarkus leaving the final decision and cherrypick to you.
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akshedu, hakman

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[olemarkus]

/lgtm

Thanks for this!