Get the maximum ID of the Qemu VMs

        :return: Maximum Qemu VM ID
        :rtype: int

def get_qemus(self):
        """
        Get the maximum ID of the Qemu VMs

        :return: Maximum Qemu VM ID
        :rtype: int
        """
        qemu_vm_list = []
        qemu_vm_max = None
        for node in self.nodes:
            if node['type'] == 'QemuVM':
                qemu_vm_list.append(node['qemu_id'])

        if len(qemu_vm_list) > 0:
            qemu_vm_max = max(qemu_vm_list)
        return qemu_vm_max