sla: T4222: Add OWAMP and TWAMP for service sla

OWAMP is a command line client application and a policy daemon used
to determine one way latencies between hosts.
OWAMP session control uses traditional client-server communication
between a control-client and a server,
TWAMP (two-way active measurement protocol)
Add configuration and operation modes

set service sla owamp-server
set service sla twamp-server
run force owping 192.0.2.120
run force twping 192.0.2.190