Fix uniform sampling GitHub

[knorth55]

• add UniformSampling in nodelet xml.
• now indices are not correctly registered.
  • uniform_sampling.getIndices() returns all indices
  • we need to get the indices from all_indices - removed_indices.
  • ref: https://github.com/PointCloudLibrary/pcl/blob/2f9dc390c6769fbd821fafa0e16f4707ed7c5d79/tools/uniform_sampling.cpp#L104-L116

[k-okada]

/workspace/ros/ws_jsk_recognition/src/jsk_recognition/jsk_pcl_ros/src/uniform_sampling_nodelet.cpp: In member function ?virtual void jsk_pcl_ros::UniformSampling::sampling(const ConstPtr&)?:
/workspace/ros/ws_jsk_recognition/src/jsk_recognition/jsk_pcl_ros/src/uniform_sampling_nodelet.cpp:86:62: error: no matching function for call to ?pcl::UniformSampling<pcl::PointXYZ>::UniformSampling(bool)?
     pcl::UniformSampling<pcl::PointXYZ> uniform_sampling(true);
                                                              ^
In file included from /workspace/ros/ws_jsk_recognition/src/jsk_recognition/jsk_pcl_ros/src/uniform_sampling_nodelet.cpp:41:0:
/usr/include/pcl-1.8/pcl/filters/uniform_sampling.h:75:7: note: candidate: pcl::UniformSampling<PointT>::UniformSampling() [with PointT = pcl::PointXYZ]
       UniformSampling () :
       ^~~~~~~~~~~~~~~

I think kinetic/melodic uses pcl <= 1.6
https://launchpad.net/ubuntu/+source/libpcl1/1.6-2