Refactor initscript creation

[justinsb]

Creation of the initscript can be (partially) refactored out from the
cloudup mega-package, which will help us reuse it in cluster-api.

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[k8s-ci-robot]

PR needs rebase.

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[k8s-ci-robot]

@justinsb: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-verify-govet	e70cc7b	link	true	/test pull-kops-verify-govet
pull-kops-verify-golangci-lint	e70cc7b	link	true	/test pull-kops-verify-golangci-lint
pull-kops-test	e70cc7b	link	true	/test pull-kops-test
pull-kops-kubernetes-e2e-ubuntu-gce-build	e70cc7b	link	true	/test pull-kops-kubernetes-e2e-ubuntu-gce-build
pull-kops-verify-hashes	e70cc7b	link	true	/test pull-kops-verify-hashes

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the PR is closed

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• Mark this PR as fresh with /remove-lifecycle rotten
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/lifecycle rotten