CBPS-1041 scan files with concurrency 16

Change-Id: I58e20764cb8ecd7241de498a10352888ddf7ab6f
Reviewed-on: https://review.couchbase.org/c/perfrunner/+/179563
Tested-by: Build Bot <[email protected]>
Reviewed-by: vikas chaudhary <[email protected]>

Author: vikas-getconnect