suppress legacy cgruop warning in older deamons

[nagworld9]

Description

Older versions of the daemon (2.2.31-2.2.40) wrote their PID to /sys/fs/cgroup/{cpu,memory}/WALinuxAgent/WALinuxAgent. When running under systemd this could produce invalid resource usage data. Cgroups should not be enabled under this condition.

The agent disables cgroups if it detects above case. This is known issue and so ignore this warning in dcr.

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 #2539 (12b6857) into develop (ae89acd) will increase coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2539      +/-   ##
===========================================
+ Coverage    71.99%   72.06%   +0.06%     
===========================================
  Files          102      102              
  Lines        15202    15202              
  Branches      2406     2406              
===========================================
+ Hits         10945    10955      +10     
+ Misses        3776     3770       -6     
+ Partials       481      477       -4     

Impacted Files	Coverage Δ
azurelinuxagent/common/event.py	86.03% <0.00%> (+0.67%)	⬆️
azurelinuxagent/ga/collect_telemetry_events.py	92.12% <0.00%> (+2.39%)	⬆️

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