APT: Patch Mode set to disabled in ConfigurePatching when os patch config file does not exist

[rane-rajasi]

Issue:

• ConfigurePatching is marked as failed if '/etc/apt/apt.conf.d/20auto-upgrades' is not found.

'/etc/apt/apt.conf.d/20auto-upgrades' not existing on a VM has been observed to be an indication that default auto updates are not configured. The config file is only created the very first time auto updates are configured on the machine. Hence, non existence of the file can be safely considered as default auto updates are disabled. This also aligns with the implementation patterns used in YUM and Zypper package managers where a config not existing is considered as default updates disabled.

Desired behavior from this PR:
If '/etc/apt/apt.conf.d/20auto-upgrades' is not found:

• automaticOSPatchState in Configure Patching is marked as Disabled
• ConfigurePatching status does not fail due to this config not existing

[codecov]

Codecov Report

Merging #216 (da5898d) into master (dae984a) will increase coverage by 0.01%.
Report is 1 commits behind head on master.
The diff coverage is 98.95%.

@@            Coverage Diff             @@
##           master     #216      +/-   ##
==========================================
+ Coverage   90.19%   90.21%   +0.01%     
==========================================
  Files          90       90              
  Lines       14483    14539      +56     
==========================================
+ Hits        13063    13116      +53     
- Misses       1420     1423       +3     

Flag	Coverage Δ
python27	90.21% <98.95%> (+0.01%)	⬆️
python39	90.21% <98.95%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/core/src/service_interfaces/StatusHandler.py	94.80% <96.29%> (+0.40%)	⬆️
src/core/src/bootstrap/Constants.py	98.59% <100.00%> (+<0.01%)	⬆️
...ore/src/package_managers/AptitudePackageManager.py	89.62% <100.00%> (+0.02%)	⬆️
src/core/tests/Test_AptitudePackageManager.py	99.49% <100.00%> (+<0.01%)	⬆️
src/core/tests/Test_ConfigurePatchingProcessor.py	99.04% <100.00%> (ø)
src/core/tests/Test_StatusHandler.py	99.77% <100.00%> (+0.01%)	⬆️

... and 1 file with indirect coverage changes

[kjohn-msft]

Please fill in description to describe current behavior and desired behavior.

[kjohn-msft]

LGTM, minor questions inline

[rane-rajasi]

Please fill in description to describe current behavior and desired behavior.

done