Revert removing distro info from logs

[pgombar]

Description

This line got removed in #1635 by mistake, adding it back since it's useful to have in the log.

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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.
• Except for special cases involving multiple contributors, the PR is started from a fork of the main repository, not a branch.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and Travis.CI is passing.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

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This change is 

[codecov]

Codecov Report

Merging #1681 into develop will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #1681      +/-   ##
===========================================
+ Coverage    67.34%   67.35%   +<.01%     
===========================================
  Files           80       80              
  Lines        11433    11434       +1     
  Branches      1605     1605              
===========================================
+ Hits          7700     7701       +1     
  Misses        3393     3393              
  Partials       340      340

Impacted Files	Coverage Δ
azurelinuxagent/daemon/main.py	73.19% <100%> (+0.27%)	⬆️

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[larohra]

LGTM