modifying the script to add parallelism (parallel) and adding new command line flags
Usage: ovn_cleanConntrack.sh
Help: ovn_cleanConntrack.sh -h
Limit the execution to a single node: ovn_cleanConntrack.sh -n node
Save extra debug lines into the log: ovn_cleanConntrack.sh -d
modifying the script to add parallelism (parallel) and adding new command line flags