Common service diagnostics

GLOBAL
    - oam
        - svc-ping {ip-addr} service service-id [local-sdp] [remote-sdp]
        - dns target-addr dns-name name-server ip-address [source ip-address] [count send-count] [timeout timeout] [interval interval]
        - vprn-ping service-id service svc-name source ip-address destination ip-address [fc fc-name [size size] [ttl vc-label-ttl] [return-control] [interval interval] [count send-count] [timeout timeout]
        - vprn-trace service-id source src-ip destination ip-address [fc fc-name ] [size size] [min-ttl vc-label-ttl] [max-ttl vc-label-ttl] [return-control] [probe-count sendcount] [interval interval] [timeout timeout]