pyvmomi 6.0 how to create vm with iscsi disk

[luofei163]

add disk error
pyVmomi.VmomiSupport.InvalidController: (vim.fault.InvalidController) {
dynamicType = ,
dynamicProperty = (vmodl.DynamicProperty) [],
msg = "The device '2' is referring to a nonexisting controller '1,000'.",
faultCause = ,
faultMessage = (vmodl.LocalizableMessage) [],
property = u'virtualDeviceSpec.operation',
deviceIndex = 2,
controllerKey = 1000