Update image for check_grid_nfiles
Description of bug
image: gitlab-registry.cern.ch/atlas-physics/pmg/mcjoboptions:eos_bash
has been causing issues with copying of gridpacks giving "ERROR: operation not permitted"
See !3457 (closed)
Changes introduced
Switch to atlasadc/atlas-grid-centos7 which seems to work
Tests
Issues resolved
Closes #