chore: update cluster-autoscalers to latest patches

[mboersma]

Reason for Change:

See https://github.com/kubernetes/autoscaler/releases/tag/cluster-autoscaler-1.18.3
and https://github.com/kubernetes/autoscaler/releases/tag/cluster-autoscaler-1.17.4
and https://github.com/kubernetes/autoscaler/releases/tag/cluster-autoscaler-1.16.7
and #3996

Issue Fixed:

Credit Where Due:

Does this change contain code from or inspired by another project?

• No
• Yes

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[mboersma]

/hold

This has a temporary testing commit that needs to be discarded before merging.

[codecov]

Codecov Report

Merging #4000 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4000   +/-   ##
=======================================
  Coverage   73.68%   73.68%           
=======================================
  Files         147      147           
  Lines       23161    23161           
=======================================
  Hits        17067    17067           
  Misses       4979     4979           
  Partials     1115     1115           

Impacted Files	Coverage Δ
pkg/api/k8s_versions.go	100.00% <ø> (ø)

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[mboersma]

/azp run AKS Engine VHD Pipeline

[azure-pipelines]

No pipelines are associated with this pull request.

[mboersma]

New autoscalers passed our CI for 1.16 to 1.18:

I'll strip off the testing commit and then this should be ready for review.

[mboersma]

/hold cancel

[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, mboersma

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