test: e2e driver pass identity system to upgrade and scale commands

[haofan-ms]

Reason for Change:

The previous e2e test was failing on Azure Stack ADFS environment, as there was no --identity-system parameter in the aks-engine scale and aks-engine upgrade commands.

BTW: the documentation about scale and upgrade may need an update as well.

Issue Fixed:

Requirements:

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

Notes:

[jadarsie]

lgtm

[codecov]

Codecov Report

Merging #3582 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3582   +/-   ##
=======================================
  Coverage   73.17%   73.17%           
=======================================
  Files         147      147           
  Lines       25110    25110           
=======================================
  Hits        18373    18373           
  Misses       5605     5605           
  Partials     1132     1132           

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[jadarsie]

/lgtm

[acs-bot]

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