I am testing jsonrpc changes using master branch with fencing flow and noticed something strange.

I am sending following message to vdsm:

{"jsonrpc":"2.0","method":"Host.fenceNode","params":{"addr":"rack05-pdu01-lab4.tlv.redhat.com","port":"","agent":"apc_snmp","username":"emesika","password":"<removed>","action":"off","options":"port=15"},"id":"c212299f-42b5-485d-b9ba-bc9880628743"}

and I see this error in vdsm logs:

sonRpcServer::DEBUG::2014-05-21
13:23:29,405::__init__::493::jsonrpc.JsonRpcServer::(serve_requests)
Waiting for request
Thread-100::DEBUG::2014-05-21
13:23:29,405::API::1124::vds::(fenceNode)
fenceNode(addr=rack05-pdu01-lab4.tlv.redhat.com,port=,agent=apc_snmp,user=emesika,passwd=XXXX,action=status,secure=port=15,options=)
Thread-100::DEBUG::2014-05-21
13:23:29,405::utils::729::root::(execCmd) u'/usr/sbin/fence_apc_snmp'
(cwd None)
Thread-100::DEBUG::2014-05-21
13:23:30,412::utils::749::root::(execCmd) FAILED: <err> =
"ERROR:root:Failed: You have to enter plug number or machine
identification\n\nERROR:root:Please use '-h' for usage\n\n"; <rc> = 1
Thread-100::DEBUG::2014-05-21 13:23:30,412::API::1111::vds::(fence) rc
1 inp agent=fence_apc_snmp
ipaddr=rack05-pdu01-lab4.tlv.redhat.com
login=emesika
action=status
passwd=XXXX
 out [] err ['ERROR:root:Failed: You have to enter plug number or
machine identification', '', "ERROR:root:Please use '-h' for usage",
'']
Thread-100::DEBUG::2014-05-21
13:23:30,412::API::1147::vds::(fenceNode) rc 1 in agent=fence_apc_snmp
ipaddr=rack05-pdu01-lab4.tlv.redhat.com
login=emesika
action=status
passwd=XXXX
 out [] err ['ERROR:root:Failed: You have to enter plug number or
machine identification', '', "ERROR:root:Please use '-h' for usage",
'']
Thread-100::DEBUG::2014-05-21
13:23:30,413::stompReactor::112::yajsonrpc.StompServer::(send) Sending
response