[Haizea] lease specification for Haizea in opennebula mode

[Maulik Shah]

I want to specify no. of nodes used by an  advance reservation lease but I am not able to find how to specify it in opennebula vm template. all I know is we can specify 
MEMORY = 128
  CPU  = 0.5and using haizea parameterHAIZEA = [
start = "+00:00:30",
duration = "00:01:00",
preemptible = "no"
]

it results in creating a VM on any one node (haizea fetches 3 nodes(1-server and 2-nodes)) and runs that lease on vm. 
how to specify a lease for more than one node. Is It the group parameter mentioned in haizea manual?
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