QA output created by 143
{ 'execute': 'qmp_capabilities' }
{"return": {}}
{ 'execute': 'nbd-server-start',
       'arguments': { 'addr': { 'type': 'unix',
                                'data': { 'path': 'SOCK_DIR/nbd' }}}}
{"return": {}}
qemu-io: can't open device nbd+unix:///no_such_export?socket=SOCK_DIR/nbd: Requested export not available
server reported: export 'no_such_export' not present
qemu-io: can't open device nbd+unix:///aa--aa1?socket=SOCK_DIR/nbd: Requested export not available
server reported: export 'aa--aa...' not present
{ 'execute': 'quit' }
{"return": {}}
{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}
*** done