Network interface

[harry17189]

The ROS node does not read arguments to set a different interface name.
It always selects the default "eth0".

It does read a private param to set it.
But is not used in the launch file.
This can be done by changing the launch file to :

<node name="driver_node_0" pkg="reflex_driver" type="reflex_driver_node" output="screen" required="true">
	<param name="network_interface" type="string" value="eth0" />
</node>

This allows easy change of the network interface name which is not standard "eth0".

I tried to create a pull request, but failed, so I hope this can be done by the developers.

Dennis