api: fix scale or upgrade systemvm

[weizhouapache]

Description

This PR fixes an issue when scale systemvm, when "allow.diskoffering.change.during.scale.vm" is set to "true"

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• build/CI
• test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 15.17%. Comparing base (0d5a0ea) to head (660eef7).
Report is 1 commits behind head on 4.19.

Files with missing lines	Patch %	Lines
...k/api/command/admin/systemvm/ScaleSystemVMCmd.java	0.00%	1 Missing ⚠️
...api/command/admin/systemvm/UpgradeSystemVMCmd.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.19   #11062      +/-   ##
============================================
- Coverage     15.18%   15.17%   -0.01%     
+ Complexity    11365    11363       -2     
============================================
  Files          5416     5416              
  Lines        475890   475911      +21     
  Branches      58093    58096       +3     
============================================
- Hits          72254    72238      -16     
- Misses       395550   395586      +36     
- Partials       8086     8087       +1     

Flag	Coverage Δ
uitests	4.28% <ø> (ø)
unittests	15.90% <0.00%> (-0.01%)	⬇️

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