Run TestSCT_DistortionsTool.py with --threads=5 for 20 events (ATLASRECTS-4832)

Susumu Odarequested to merge
oda/athena:master-SCT_ModuleDistortions into master

Run TestSCT_DistortionsTool.py with --threads=5 for 20 events

https://its.cern.ch/jira/browse/ATLASRECTS-4832

Merge request reports