vxlan: do not create duplicated network for private gateway

[weizhouapache]

Description

This PR fixes #7891

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

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?

[weizhouapache]

@blueorangutan package

[blueorangutan]

@weizhouapache a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 14.96%. Comparing base (1577218) to head (0ecf105).
Report is 9 commits behind head on 4.19.

Files	Patch %	Lines
.../com/cloud/network/guru/VxlanGuestNetworkGuru.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.19    #9232      +/-   ##
============================================
- Coverage     14.96%   14.96%   -0.01%     
- Complexity    11002    11003       +1     
============================================
  Files          5373     5377       +4     
  Lines        469315   469465     +150     
  Branches      59847    61125    +1278     
============================================
+ Hits          70233    70247      +14     
- Misses       391309   391440     +131     
- Partials       7773     7778       +5     

Flag	Coverage Δ
uitests	4.30% <ø> (ø)
unittests	15.67% <0.00%> (-0.01%)	⬇️

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[blueorangutan]

Packaging result [SF]: ✔️ el7 ✔️ el8 ✔️ el9 ✔️ debian ✔️ suse15. SL-JID 9895

[weizhouapache]

@blueorangutan test rocky8 kvm-rocky8

[blueorangutan]

@weizhouapache a [SL] Trillian-Jenkins test job (rocky8 mgmt + kvm-rocky8) has been kicked to run smoke tests

[blueorangutan]

[SF] Trillian test result (tid-10423)
Environment: kvm-rocky8 (x2), Advanced Networking with Mgmt server r8
Total time taken: 44939 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr9232-t10423-kvm-rocky8.zip
Smoke tests completed. 131 look OK, 0 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File

[DaanHoogland]

clgtm

[borisstoyanov]

LGTM, checked it manually