Fix MS Host duplicate registration

[Pearl1594]

Description

In a Kubernetes setup with a stateful set configuration, virtual ip/mac address keeps changing while hostname is kept constant. In such a case, restarting pods results in multiple hosts registered with same hostname as we register using mac or ip address. This PR uses hostname as well to look for existing management server before registering a new one. Hostname could be null, in which case the implementation is same as what was present earlier.

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

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

❌ Patch coverage is 23.07692% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.71%. Comparing base (3d7d412) to head (78516ea).
⚠️ Report is 71 commits behind head on 4.20.

Files with missing lines	Patch %	Lines
...ain/java/com/cloud/cluster/ClusterManagerImpl.java	0.00%	16 Missing ⚠️
...cloud/cluster/dao/ManagementServerHostDaoImpl.java	60.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.20   #13560      +/-   ##
============================================
+ Coverage     16.26%   16.71%   +0.45%     
- Complexity    13429    14117     +688     
============================================
  Files          5661     5667       +6     
  Lines        500010   521396   +21386     
  Branches      60715    69941    +9226     
============================================
+ Hits          81331    87170    +5839     
- Misses       409606   424543   +14937     
- Partials       9073     9683     +610     

Flag	Coverage Δ
uitests	4.09% <ø> (-0.07%)	⬇️
unittests	17.58% <23.07%> (+0.45%)	⬆️

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[sonarqubecloud]

Quality Gate failed

Failed conditions
16.4% Coverage on New Code (required ≥ 40%)

See analysis details on SonarQube Cloud