(None) - starts a new machine
'lxc' - starts a new machine with on lxc container
'lxc:4' - starts a new lxc container on machine 4
'ssh:user@10.10.0.3' - manually provisions a machine with ssh
'zone=us-east-1a' - starts a machine in zone us-east-1s on AWS
'maas2.name' - acquire machine maas2.name on MAAS
(None) - starts a new machine
'lxc' - starts a new machine with on lxc container
'lxc:4' - starts a new lxc container on machine 4
'ssh:user@10.10.0.3' - manually provisions a machine with ssh
'zone=us-east-1a' - starts a machine in zone us-east-1s on AWS
'maas2.name' - acquire machine maas2.name on MAAS