Fix agent wait before reconnect

[sureshanaparti]

Description

There is a regression in 4.20.1 & 4.20.2 which is resulting in the issue #8517.

This PR fixes the agent wait before reconnect, applies the fix in #9258 with minor log updates.

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?

Patched the agent changes to 4.20.2 env with 3 kvm hosts, and restarted agents in all the kvm hosts. Verfied the CPU util in MS.

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

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.17%. Comparing base (4dc3931) to head (d21aaa4).
⚠️ Report is 14 commits behind head on 4.20.

Files with missing lines	Patch %	Lines
agent/src/main/java/com/cloud/agent/Agent.java	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.20   #12153      +/-   ##
============================================
- Coverage     16.18%   16.17%   -0.01%     
+ Complexity    13304    13298       -6     
============================================
  Files          5657     5657              
  Lines        498464   498475      +11     
  Branches      60491    60493       +2     
============================================
- Hits          80695    80649      -46     
- Misses       408787   408852      +65     
+ Partials       8982     8974       -8     

Flag	Coverage Δ
uitests	4.00% <ø> (-0.01%)	⬇️
unittests	17.03% <0.00%> (-0.02%)	⬇️

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[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 15842

[sureshanaparti]

@blueorangutan test

[blueorangutan]

@sureshanaparti a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests