Introduce the capability to attach an external command (e.g perf or
strace) to a running ovn-scale-test for debugging purpose.
The external program can be attached before starting the workload
defining a given task in the json configuration file or providing
the start and stop iteration in the workload configuration
Introduce the capability to attach an external command (e.g perf or strace) to a running ovn-scale-test for debugging purpose. The external program can be attached before starting the workload defining a given task in the json configuration file or providing the start and stop iteration in the workload configuration