Add a physical item e.g router, cloud etc

        :param instance: Hypervisor instance
        :param item: Item to add

def add_physical_item(self, instance, item):
        """
        Add a physical item e.g router, cloud etc

        :param instance: Hypervisor instance
        :param item: Item to add
        """
        (name, dev_type) = self.device_typename(item)
        self.topology['devices'][name] = {}
        self.topology['devices'][name]['hv_id'] = self.hv_id
        self.topology['devices'][name]['node_id'] = self.nid
        self.topology['devices'][name]['from'] = dev_type['from']
        self.topology['devices'][name]['type'] = dev_type['type']
        self.topology['devices'][name]['desc'] = dev_type['desc']

        if 'ext_conf' in dev_type:
            self.topology['devices'][name]['ext_conf'] = dev_type['ext_conf']

        for s_item in sorted(self.old_top[instance][item]):
            if self.old_top[instance][item][s_item] is not None:
                self.topology['devices'][name][s_item] = \
                    self.old_top[instance][item][s_item]

        if instance != 'GNS3-DATA' and \
                self.topology['devices'][name]['type'] == 'Router':
            if 'model' not in self.topology['devices'][name]:
                self.topology['devices'][name]['model'] = \
                    self.topology['conf'][self.hv_id]['model']
            else:
                self.topology['devices'][name]['model'] = MODEL_TRANSFORM[
                    self.topology['devices'][name]['model']]
        elif dev_type['type'] == 'VirtualBoxVM':
            self.topology['devices'][name]['vbox_id'] = self.vbox_id
            self.vbox_id += 1
        elif dev_type['type'] == 'QemuVM':
            self.topology['devices'][name]['qemu_id'] = self.qemu_id
            self.qemu_id += 1

        if instance != 'GNS3-DATA' \
            and 'hx' not in self.topology['devices'][name] \
                and 'hy' not in self.topology['devices'][name]:
            self.topology['devices'][name]['hx'] = dev_type['label_x']
            self.topology['devices'][name]['hy'] = -25.0
        self.nid += 1