Add vmimage dependency runner

[harvey0100]

VM image dependencies in tests

• Comprehensive functional tests in runner_vmimage.py
• Documentation section in dependencies guide
• Example test and recipe JSON
• Integration with resolver and check systems
• Setup.py entry points for plugin discovery

Reference: #6043

[codecov]

Codecov Report

Attention: Patch coverage is 53.44828% with 27 lines in your changes missing coverage. Please review.

Project coverage is 67.12%. Comparing base (0e6226f) to head (a725e50).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
avocado/plugins/runners/vmimage.py	53.44%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6112      +/-   ##
==========================================
- Coverage   67.16%   67.12%   -0.04%     
==========================================
  Files         203      204       +1     
  Lines       21973    22035      +62     
==========================================
+ Hits        14758    14792      +34     
- Misses       7215     7243      +28     

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[richtja]

Hi @harvey0100, thank you very much for looking into the vmimage runner. I have added few comments which IMO could simplify the current solution. Please take a look and let me know what do you think.

[harvey0100]

Hi @richtja I've made changes towards your comments, the caching section was removed as this is already implemented in the vmimage plugin already.

[richtja]

Hi @harvey0100, thank you very much for the updates. I have added few comments, please let me know what you think about it.