[cob_sick_s300] cob_sick_s300 node uses global parameters

[mitchallain]

It appears that the cob_sick_s300 node loads parameters from the global namespace, rather than a private namespace. This makes it tricky to use multiple drivers simultaneously. I have resorted to launching the nodes in a group namespace using the group tag, i.e.

<group ns="front">
  <node pkg="cob_sick_s300" type="cob_sick_s300" name="front_laser" />
</group>

so that parameters like port can be specified in the front namespace

I have used versions of this driver in the past which did not require this namespace trickery, so I'm not sure why the change was made.

@fmessmer FYI

[fmessmer]

https://github.com/ipa320/cob_driver/pull/331 is related

maybe we consider this when finalizing ipa320/cob_robots#732 (comment)