Custom sysctl Parameters

[ripta]

This adds a new sysctlParameters to cluster spec and instance group spec to allow setting custom runtime kernel parameters.

I needed to be able to set sysctl parameters on our nodes. I considered adding a file asset, but we can't currently set the OnChangeExecute of a File nodetask that way. Since we already have a sysctl builder, this change seemed to be an obvious one.

[k8s-ci-robot]

Hi @ripta. Thanks for your PR.

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[ripta]

/assign @gambol9

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[ripta]

Oops. Would've been nice to not typo.

/assign @gambol99

[mikesplain]

/ok-to-test

[ripta]

/retest

[ripta]

@justinsb @mikesplain - Could I get a review? Also, looks like pull-kops-e2e-kubernetes-aws is currently broken, unrelated to this change.

[mikesplain]

/retest

[rdrgmnzs]

Hi @ripta I just went over the PR and things are looking pretty good. Could you please add documentation for it before we go ahead and merge it.

[ripta]

@rdrgmnzs - I added a section on sysctlParameters on both the cluster spec and instance group spec pages. Let me know what you think!

[johngmyers]

/test pull-kops-verify-staticcheck

[mikesplain]

This looks great. Thanks @ripta!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mikesplain, ripta

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[rifelpet]

/test pull-kops-e2e-kubernetes-aws