Add scan_topic remap argument

launch/hokuyo_laser2d.launch

@@ -3,6 +3,7 @@
 
   <arg name="config_file" default="$(find iri_hokuyo_laser2d_bringup)/config/hokuyo_utm30lx_usb.yaml" />
   <arg name="node_name" default="hokuyo_laser2d" />
+  <arg name="scan_topic" default="scan" />
   <arg name="output" default="log" />
   <arg name="launch_prefix" default="" />
 
@@ -12,6 +13,7 @@
         output="$(arg output)"
         launch-prefix="$(arg launch_prefix)">
     <rosparam file="$(arg config_file)" command="load" />
+    <remap from="scan" to="$(arg scan_topic)"/>
   </node>
 
 </launch>