extras: launch: Add teleop launch script.

mavros_extras/launch/f710_joy.yaml

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+# Joystic configuration for Logitech F710 gamepad
+# TODO: check scale, button map
+axes_map:
+  roll: 3
+  pitch: 4
+  yaw: 0
+  throttle: 1
+axes_scale:
+  poll: 1.0
+  pitch: 1.0
+  yaw: 1.0
+  throttle: 1.0
+button_map:
+  takeoff: 0
+  land: 1
+  enable: 2

mavros_extras/launch/teleop.launch

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+<launch>
+	<!-- vim: ft=roslaunch -->
+	<!-- mavteleop example launch script -->
+
+	<!-- <include file="$(find mavros)/launch/px4.launch" /> -->
+
+	<arg name="teleop_args" default="-att" />
+
+	<node pkg="joy" type="joy_node" name="joy" required="True">
+		<param name="autorepeat_rate" value="5" /> <!-- Minimal update rate, Hz -->
+	</node>
+
+	<node pkg="mavros_extras" type="mavteleop" name="mavteleop" args="$(arg teleop_args)" required="True" output="screen">
+		<rosparam command="load" file="$(find mavros_extras)/launch/f710_joy.yaml" />
+	</node>
+</launch>