--> #1 Client:AddMachines
{'Params': {'params': [{'jobs': ['JobHostUnits'], 'series': 'trusty'}]},
'Request': 'AddMachines',
'RequestId': 1,
'Type': 'Client',
'Version': 1}
<-- #1 Response
{'RequestId': 1, 'Response': {'machines': [{'machine': '1'}]}}
--------------------------------------------------------------------------------
~/code/juju-api % juju list-machines (master ⚡) ubuntu
MACHINE STATE DNS INS-ID SERIES AZ
0 started 10.0.42.14 juju-7955c4-0 trusty
1 pending 10.0.42.55 juju-7955c4-1 trusty