LBANN proto integration#76

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samadejacobs wants to merge 3 commits intoECP-CANDLE:masterfrom

samadejacobs:lbann_denas

Commits on Nov 18, 2020

Add infrastructure to generate LBANN prototext from CANDLE workflow, supports for multi trainers
samadejacobs
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Commits on Dec 9, 2020

minor update
samadejacobs
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Commits on Jan 5, 2021

More clean and broad support
samadejacobs
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