Use Debug conf parameter for agent's CPU quota

[narrieta]

Added Debug.AgentCpuQuota to waagent.conf to set up the value for the agent's CPU quota. Currently it is set to 100% (1 CPU, but automation will change it to 5%)

[codecov]

Codecov Report

Merging #2353 (213c05c) into develop (d040d21) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #2353   +/-   ##
========================================
  Coverage    70.86%   70.86%           
========================================
  Files           97       97           
  Lines        14089    14090    +1     
  Branches      2029     2029           
========================================
+ Hits          9984     9985    +1     
  Misses        3656     3656           
  Partials       449      449           

Impacted Files	Coverage Δ
azurelinuxagent/common/cgroupconfigurator.py	70.20% <100.00%> (-0.08%)	⬇️
azurelinuxagent/common/conf.py	78.63% <100.00%> (+0.19%)	⬆️

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