[WIP] test: add statefulset e2e test

[jackfrancis]

Reason for Change:

Ref: https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/

Issue Fixed:

Requirements:

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

Notes:

[acs-bot]

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[codecov]

Codecov Report

Merging #2178 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2178   +/-   ##
=======================================
  Coverage   69.33%   69.33%           
=======================================
  Files         144      144           
  Lines       24930    24930           
=======================================
  Hits        17284    17284           
  Misses       6535     6535           
  Partials     1111     1111

[jackfrancis]

note to self get rid of the inline comment

[kkmsft]

Is there a way in the aks-engine tests to scale up and down the replicas for this specific tests ?

[devigned]

Should be able to add that to the tests. @jackfrancis what do you think?

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.