Add option to skip generation of Rally reports

- When running longevity testing with Rally on a cicd node with
less then 21GB it's nesserary to turn off report generation, because
each Rally process (if PARALLEL_PERFORMANCE is enabled) consumes ~ 4GB
when rendering report on top of week amount of data

Change-Id: I48eae12f35d998df009d8a68171eacabd26f5aca
Related-bug: PROD-30433 (PROD:30433)
1 file changed