ros offboard demo: move mavros into model namespace

launch/gazebo_ardrone_empty_world_offboard_attitudedemo.launch

@@ -4,7 +4,9 @@
 <include file="$(find px4)/launch/gazebo_ardrone_empty_world.launch">
 	<arg name="ns" value="$(arg ns)"/>
 </include>
-<include file="$(find px4)/launch/mavros_sitl.launch" />
+<include file="$(find px4)/launch/mavros_sitl.launch">
+	<arg name="ns" value="$(arg ns)"/>
+</include>
 <group ns="$(arg ns)">
 	<node pkg="px4" name="demo_offboard_attitude_setpoints" type="demo_offboard_attitude_setpoints"/>
 </group>

launch/gazebo_ardrone_empty_world_offboard_positiondemo.launch

@@ -4,7 +4,9 @@
 <include file="$(find px4)/launch/gazebo_ardrone_empty_world.launch">
 	<arg name="ns" value="$(arg ns)"/>
 </include>
-<include file="$(find px4)/launch/mavros_sitl.launch" />
+<include file="$(find px4)/launch/mavros_sitl.launch">
+	<arg name="ns" value="$(arg ns)"/>
+</include>
 <group ns="$(arg ns)">
 	<node pkg="px4" name="demo_offboard_position_setpoints" type="demo_offboard_position_setpoints"/>
 </group>

launch/mavros_sitl.launch

 <launch>
-	<!-- vim: set ft=xml noet : -->
-	<!-- example launch script for PX4 based FCU's -->
+<!-- vim: set ft=xml noet : -->
+<!-- example launch script for PX4 based FCU's -->
 
+<arg name="ns"/>
+<group ns="$(arg ns)">
 	<arg name="fcu_url" default="udp://localhost:14560@localhost:14565" />
 	<arg name="gcs_url" default="" />
 	<arg name="tgt_system" default="1" />
@@ -18,4 +20,5 @@
 		<arg name="tgt_system" value="$(arg tgt_system)" />
 		<arg name="tgt_component" value="$(arg tgt_component)" />
 	</include>
+</group>
 </launch>