[OWL-543] let NQM to calcaulte RTT median and RTT mdev
[OWL-543] let NQM to calcaulte RTT median and RTT mdev

Change the fping command argument to let NQM to calculate
RTT median and RTT mdev.

Cepave/open-falcon-backend,Cepave/hbs,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,Cepave/open-falcon-backend,Cepave/hbs,Cepave/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend