feat: add support for Kubernetes v1.17.11 on Azure Stack

[jadarsie]

Reason for Change:

Pre-pull Azure Stack's custom images for K8s 1.17.11

Requirements:

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

Notes:

[codecov]

Codecov Report

Merging #3702 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3702   +/-   ##
=======================================
  Coverage   73.16%   73.16%           
=======================================
  Files         147      147           
  Lines       25318    25318           
=======================================
  Hits        18525    18525           
  Misses       5655     5655           
  Partials     1138     1138           

Impacted Files	Coverage Δ
pkg/api/common/versions.go	96.84% <ø> (ø)

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[mboersma]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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