Allow passing custom VNS configurations through a JSON file
Allow passing custom VNS configurations through a JSON file

If argument --vns-conf with the path to a valid JSON file is present,
benchmark.py will use the VNS configurations defined in this file.

fire-rs-laas/fire-rs-saop,fire-rs-laas/fire-rs-saop,fire-rs-laas/fire-rs-saop,fire-rs-laas/fire-rs-saop