Merge branch 'add_LCG_100_ATLAS_1' into 'LCG_100-patches'

[SPI-1881]: LCG_100_ATLAS_1: port forward evtGen 1.7.0 patch

See merge request !726

(cherry picked from commit bd046ab6)

e6631909 [SPI-1881]: LCG_100_ATLAS_1: port forward evtGen 1.7.0 patch
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