chore: k8s v1.17 conformance model for Azure Stack

[jadarsie]

Reason for Change:
Add cluster definition required to replicate k8s-conformance for v1.17
Related: cncf/k8s-conformance#979

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

[codecov]

Codecov Report

Merging #3338 into master will increase coverage by 0.95%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3338      +/-   ##
==========================================
+ Coverage   71.16%   72.11%   +0.95%     
==========================================
  Files         147      147              
  Lines       25771    25455     -316     
==========================================
+ Hits        18339    18357      +18     
+ Misses       6286     5959     -327     
+ Partials     1146     1139       -7     

Impacted Files	Coverage Δ
pkg/operations/kubernetesupgrade/upgradecluster.go	80.16% <0.00%> (-1.01%)	⬇️
cmd/get_logs.go	17.27% <0.00%> (-0.83%)	⬇️
pkg/armhelpers/httpMockClient.go	57.94% <0.00%> (-0.52%)	⬇️
cmd/scale.go	12.18% <0.00%> (-0.18%)	⬇️
pkg/engine/armvariables.go	86.14% <0.00%> (-0.03%)	⬇️
pkg/api/types.go	94.35% <0.00%> (-0.02%)	⬇️
pkg/engine/cse.go	100.00% <0.00%> (ø)
pkg/api/vlabs/types.go	73.30% <0.00%> (ø)
pkg/api/common/const.go	40.00% <0.00%> (ø)
pkg/api/k8s_versions.go	100.00% <0.00%> (ø)
... and 16 more

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[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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