Cgroup: set Agent CPU to 50%

[bingyuyin]

Description

Issue #
Cgroup: set Agent CPU to 50%

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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 #2591 (a3295b6) into develop (cd3b6d2) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #2591   +/-   ##
========================================
  Coverage    71.88%   71.88%           
========================================
  Files          103      103           
  Lines        15503    15503           
  Branches      2466     2466           
========================================
  Hits         11145    11145           
  Misses        3858     3858           
  Partials       500      500           

Impacted Files	Coverage Δ
azurelinuxagent/common/conf.py	79.48% <100.00%> (ø)

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[nagworld9]

Ran the DCR, looks good.
https://tuxgold.corp.microsoft.com/job/AzLinux/job/DungeonCrawler/job/DungeonCrawler.nnandigam/336/artifact/results/