[colcon][jsk_data] Support download_data with colcon #1803
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This PR solves 2 problems.
rospkg.RosPack.pkg_namedoesn't return the current building package's src directory whencolcon build. So while building the package likejsk_perception,download_datatries to download in/opt/ros/share/jsk_perceptionand fails because of permission error. This PR fixes it.colcon build,$ROS_PACKAGE_PATHalways returns the workspace's install path, not thesrcdirectory. This PR downloads data in theinstall/<some path>/sharedirectory forrospkgto find the appropriate path.cc: @sugikazu75