code: def startup_gce_instance(instance_name, project, zone, username, machine_type,
                           image, public_key, disk_name=None):
      
      log_green("Started...")
      log_yellow("...Creating GCE Jenkins Slave Instance...")
      instance_config = get_gce_instance_config(
          instance_name, project, zone, machine_type, image,
          username, public_key, disk_name
      )
      operation = _get_gce_compute().instances().insert(
          project=project,
          zone=zone,
          body=instance_config
      ).execute()
      result = gce_wait_until_done(operation)
      if not result:
          raise RuntimeError("Creation of VM timed out or returned no result")
      log_green("Instance has booted")
docs: For now, jclouds is broken for GCE and we will have static slaves
      in Jenkins.  Use this to boot them.