[Vmware to KVM Migration] Fix issue with vCenter Standalone hosts for VM listing

[nvazquez]

Description

This PR fixes the listing of VMware VMs for Migration to KVM on vCenter datacenters that have standalone hosts (don't belong to any cluster)

Example setup with standalone hosts:

Listing retrieved successfully, setting cluster field empty on the listing table:

Fixes: #11090

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?

Set standalone hosts on the datacenter, having VMs on them
List VMs for Migration on CloudStack pointing to the vCenter

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

[nvazquez]

@blueorangutan package

[blueorangutan]

@nvazquez 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 12 lines in your changes missing coverage. Please review.

Project coverage is 15.17%. Comparing base (cbd2b5a) to head (eb7447e).

Files with missing lines	Patch %	Lines
...in/java/com/cloud/hypervisor/vmware/mo/BaseMO.java	0.00%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.19   #11091      +/-   ##
============================================
- Coverage     15.17%   15.17%   -0.01%     
+ Complexity    11363    11356       -7     
============================================
  Files          5416     5416              
  Lines        475911   475921      +10     
  Branches      58096    58096              
============================================
- Hits          72241    72223      -18     
- Misses       395584   395615      +31     
+ Partials       8086     8083       -3     

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

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[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ debian ✔️ suse15. SL-JID 13921

[DaanHoogland]

@blueorangutan test ol8 vmware-80u3

[blueorangutan]

@DaanHoogland a [SL] Trillian-Jenkins test job (ol8 mgmt + vmware-80u3) has been kicked to run smoke tests

[DaanHoogland]

Suggested change

	String msg = String.format("Standalone host %s found, setting empty cluster field", hostName);
	s_logger.debug(msg);
	String msg = String.format(“Host %s not found, assuming standalone host, setting cluster name as empty", hostName);
	s_logger.info(msg);

[weizhouapache]

code lgtm