Fix utf-encoding for reporting firewall-setup logs

[larohra]

Description

Fix utf-encoding for reporting firewall-setup logs

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 #2233 (a965f66) into develop (5a97dec) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff            @@
##           develop    #2233   +/-   ##
========================================
  Coverage    70.63%   70.63%           
========================================
  Files           96       96           
  Lines        13615    13616    +1     
  Branches      1928     1928           
========================================
+ Hits          9617     9618    +1     
  Misses        3583     3583           
  Partials       415      415           

Impacted Files	Coverage Δ
azurelinuxagent/common/persist_firewall_rules.py	76.38% <66.66%> (+0.16%)	⬆️

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The base branch was changed.