Log if Autoupdate flags are changed in conf

[larohra]

Description

Log if Autoupdate flags are changed in conf file externally from the defaults

Issue #

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PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

Merging #2385 (8f2857b) into develop (bf03740) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #2385      +/-   ##
===========================================
+ Coverage    71.14%   71.16%   +0.01%     
===========================================
  Files           97       97              
  Lines        14384    14387       +3     
  Branches      2076     2077       +1     
===========================================
+ Hits         10234    10238       +4     
+ Misses        3689     3688       -1     
  Partials       461      461              

Impacted Files	Coverage Δ
azurelinuxagent/ga/update.py	88.74% <100.00%> (+0.04%)	⬆️
azurelinuxagent/common/conf.py	79.20% <0.00%> (+0.44%)	⬆️

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