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/opt/ros/hydro/share/velodyne
is a meta-package, the catkin version of the old rosbuild velodyne stack. I am not sure why your velodyne package does not take precedence over that one, but having two different packages with the same name seems likely to cause problems.
You can uninstall that package. It is just use a convenient way to install velodyne_driver, velodyne_msgs and velodyne_pointcloud.