Switch to the system dependency for octomap.

This ensures that we have a consistent ABI between
this package that uses octomap, and anything else in
the system that might use it.  We'll eventually be
remove the octomap that we currently have vendored within
ROS itself so we can ensure this.

Signed-off-by: Chris Lalancette <clalancette@gmail.com>

package.xml

@@ -28,7 +28,7 @@
   <depend>eigen</depend>
   <depend>boost</depend>
   <depend>assimp</depend>
-  <depend>octomap</depend>
+  <depend>liboctomap-dev</depend>
   <depend>eigenpy</depend>
 
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