feat: add support for Kubernetes v1.19.2

[mboersma]

Reason for Change:

See https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.19.md#changelog-since-v1191

Issue Fixed:

Requirements:

• Kubernetes artifacts built and pushed by Azure Pipelines
• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[codecov]

Codecov Report

Merging #3842 into master will decrease coverage by 0.37%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3842      +/-   ##
==========================================
- Coverage   73.20%   72.83%   -0.38%     
==========================================
  Files         148      149       +1     
  Lines       25428    23171    -2257     
==========================================
- Hits        18614    16876    -1738     
+ Misses       5679     5178     -501     
+ Partials     1135     1117      -18     

Impacted Files	Coverage Δ
pkg/api/common/versions.go	96.37% <ø> (-0.48%)	⬇️
pkg/armhelpers/resourceskus.go	50.00% <0.00%> (-10.00%)	⬇️
pkg/armhelpers/subscriptions.go	50.00% <0.00%> (-10.00%)	⬇️
pkg/armhelpers/azurestack/subscriptions.go	50.00% <0.00%> (-10.00%)	⬇️
pkg/i18n/i18n.go	57.77% <0.00%> (-7.68%)	⬇️
pkg/armhelpers/network.go	42.85% <0.00%> (-7.15%)	⬇️
pkg/armhelpers/azurestack/network.go	42.85% <0.00%> (-7.15%)	⬇️
pkg/api/common/net.go	73.91% <0.00%> (-5.40%)	⬇️
pkg/armhelpers/support_validator.go	58.92% <0.00%> (-5.14%)	⬇️
pkg/armhelpers/azurestack/resultPageClient.go	28.84% <0.00%> (-4.49%)	⬇️
... and 140 more

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[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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