server: pass network label of physical network when plug nic for private gateway on hypervisor

[weizhouapache]

Description

This PR fixes #11798

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 4.00%. Comparing base (eee43e5) to head (26c0329).
⚠️ Report is 2 commits behind head on 4.20.

❗ There is a different number of reports uploaded between BASE (eee43e5) and HEAD (26c0329). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (eee43e5)	HEAD (26c0329)
unittests	1	0

Additional details and impacted files

@@              Coverage Diff              @@
##               4.20   #11846       +/-   ##
=============================================
- Coverage     16.17%    4.00%   -12.17%     
=============================================
  Files          5656      402     -5254     
  Lines        498349    32663   -465686     
  Branches      60480     5808    -54672     
=============================================
- Hits          80597     1309    -79288     
+ Misses       408778    31201   -377577     
+ Partials       8974      153     -8821     

Flag	Coverage Δ
uitests	4.00% <ø> (ø)
unittests	?

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