Added a new requestAgents option to define custom requesting agents

[codenirvana]

Closes #2349

[codecov]

Codecov Report

Merging #2392 into develop will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #2392   +/-   ##
========================================
  Coverage    90.80%   90.81%           
========================================
  Files           21       21           
  Lines         1088     1089    +1     
  Branches       327      328    +1     
========================================
+ Hits           988      989    +1     
  Misses         100      100           

Flag	Coverage Δ
#cli	83.19% <100.00%> (-0.17%)	⬇️
#integration	42.69% <100.00%> (+0.05%)	⬆️
#library	60.05% <100.00%> (+0.03%)	⬆️
#unit	77.04% <100.00%> (+0.02%)	⬆️

Impacted Files	Coverage Δ
lib/run/index.js	93.44% <100.00%> (+0.05%)	⬆️

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