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Configuration in ROS is not done with one config file per node. You use what's called the parameter server:

http://www.ros.org/wiki/Parameter%20Server

The files you are finding (cfgs) are for a very convenient way to change parameters without restarting the node: dynamic reconfigure.

http://ros.org/wiki/hokuyo_node/Tutorials/UsingReconfigureGUIToChangeHokuyoLaserParameters