curl -i -X PUT -H 'Accept: application/json' -H 'Content-type: application/json' -u user:userpass -d '{"virtual_machine":{"label":"Test_API_Edit","memory":"512","cpu_shares":"40","cpus":"4","allow_migration":"1","primary_disk_min_iops":"600","swap_disk_min_iops":"600","allow_cold_resize":"1"}}' --url <api_url>/virtual_machines/:id.json