Host creation from Red Hat Satellite 6 with volume options does not create multiple volumes.

Issue

• While creating host with multiple volumes it fails if the syntax is incorrect.

# hammer host create \
--name host.example.com \
--organization-id 1 \
--location-id 2 \
--ansible-role-ids '["99", "103", "138"]' \
--build False \
--hostgroup-id 22 \
--managed True \
--interface='{
    "ip": "IP Address",
    "type": "interface",
    "subnet_id": "4",
    "domain_id": "1",
    "compute_type": "VMWare"
}' \
--volume='[{
    "name": "name of the volume",
    "datastore": "name or ID of Datastore",
    "mode": "persistent",
    "size_gb": "50",
    "thin": "False",
    "controller_key": "1000"
}, {
    "name": "name of the volume",
    "datastore": "name or ID of Datastore",
    "mode": "persistent",
    "size_gb": "20",
    "thin": "False",
    "controller_key": "1001"
}]' \