kvm,utils/test,config/test: fix flaky unit tests

[shwstppr]

Description

Fixes flakiness in unit test causing packaging failures.
Improves disconnect hook handling for KVM

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):

Failures see

14:31:39 [ERROR]   LazyCacheTest.testLoaderNotCalledIfPresent:63 
14:31:39 function.apply("key2");
14:31:39 Wanted 1 time:
14:31:39 -> at org.apache.cloudstack.utils.cache.LazyCacheTest.testLoaderNotCalledIfPresent(LazyCacheTest.java:63)
14:31:39 But was 2 times:
14:31:39 -> at com.github.benmanes.caffeine.cache.LocalLoadingCache.lambda$newMappingFunction$3(LocalLoadingCache.java:183)
14:31:39 -> at com.github.benmanes.caffeine.cache.LocalLoadingCache.lambda$newMappingFunction$3(LocalLoadingCache.java:183)

...

16:51:51 [ERROR] Failures: 
16:51:51 [ERROR]   LazyCacheTest.testMaximumSize:113 
16:51:51 function.apply("key7");
16:51:51 Wanted 2 times:
16:51:51 -> at org.apache.cloudstack.utils.cache.LazyCacheTest.testMaximumSize(LazyCacheTest.java:113)
16:51:51 But was 1 time:
16:51:51 -> at com.github.benmanes.caffeine.cache.LocalLoadingCache.lambda$newMappingFunction$3(LocalLoadingCache.java:183)
16:51:51 
16:51:51 [INFO] 
16:51:51 [ERROR] Tests run: 2696, Failures: 1, Errors: 0, Skipped: 1

10:20:17 [ERROR] Failures: 
10:20:17 [ERROR]   ConfigKeyScheduledExecutionWrapperTest.scheduleDynamicTest:110 Runnable ran four times per second
10:20:17 Expected: one of {<7>, <8>}
10:20:17      but: was <9>
10:20:17 [INFO] 
10:20:17 [ERROR] Tests run: 27, Failures: 1, Errors: 0, Skipped: 0

...

12:55:18 [ERROR] Failures: 
12:55:18 [ERROR]   ConfigKeyScheduledExecutionWrapperTest.scheduleDynamicTest:110 Runnable ran four times per second
12:55:18 Expected: one of {<7>, <8>}
12:55:18      but: was <6>
12:55:18 [INFO] 
12:55:18 [ERROR] Tests run: 27, Failures: 1, Errors: 0, Skipped: 0

17:07:14 [ERROR] Failures: 
17:07:14 [ERROR]   DisconnectHooksTest.addAndRunTwoHooksWithTimeout:166
17:07:14 [INFO] 
17:07:14 [ERROR] Tests run: 576, Failures: 1, Errors: 0, Skipped: 2

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

[codecov]

Codecov Report

❌ Patch coverage is 39.13043% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.55%. Comparing base (b99a030) to head (a2ea1e1).
⚠️ Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
...ervisor/kvm/resource/LibvirtComputingResource.java	39.13%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #11834      +/-   ##
============================================
- Coverage     17.56%   17.55%   -0.02%     
- Complexity    15500    15524      +24     
============================================
  Files          5899     5907       +8     
  Lines        527793   528671     +878     
  Branches      64479    64558      +79     
============================================
+ Hits          92714    92809      +95     
- Misses       424653   425429     +776     
- Partials      10426    10433       +7     

Flag	Coverage Δ
uitests	3.58% <ø> (-0.01%)	⬇️
unittests	18.62% <39.13%> (-0.02%)	⬇️

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