[10_6_X] Backport concurrent GEN utilities#34527

Merged

cmsbuild merged 12 commits intocms-sw:CMSSW_10_6_Xfrom

Aug 31, 2021

Add argument postGenerationCommand to ExternalLHEProducer and provide mergeLHE.py script (10_6_X)
colizz
committed
Allow specification of ES modules in ExternalGeneratorFilter (10_6_X)
colizz
committed
Specify separate directories to run external instances in ExternalGeneratorFilter (10_6_X)
colizz
committed
Fix the MadGraph5 LO multithread utility (10_6_X)
colizz
committed
Extend the external process wait time for ExternalGeneratorFilter (10_6_X)
colizz
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Use the original GEN module name for ExternalGeneratorFilter in recognizing generator types (10_6_X)
colizz
committed

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