fix: remove NSG rules for AzureStack

[haofan-ms]

Reason for Change:

These NSG rules were added specifically for Azure Stack regarding a previous bug. Now the bug on Azure Stack has been fixed, these NSG rules can be removed.

Issue Fixed:

Credit Where Due:

Does this change contain code from or inspired by another project?

• No
• Yes

If "Yes," did you notify that project's maintainers and provide attribution?

• No
• Yes

Requirements:

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

Notes:

[codecov]

Codecov Report

Merging #3914 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3914      +/-   ##
==========================================
- Coverage   72.85%   72.82%   -0.04%     
==========================================
  Files         149      149              
  Lines       23220    23191      -29     
==========================================
- Hits        16917    16888      -29     
  Misses       5182     5182              
  Partials     1121     1121              

Impacted Files	Coverage Δ
pkg/engine/networksecuritygroups.go	100.00% <ø> (ø)

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[jackfrancis]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: haofan-ms, honcao, jackfrancis

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