Fix missing pkg_name in install_sample_data.py

[wkentaro]

Problem

pkg_name argument is required.
And ./install_sample_data.py fails...

Why this happens?

Because of the merge commit.
You can see git show 338d9b850623cb614eb5596fba9c6b7ff1e2b9c9.
The git log says @k-okada triggered git merge in #1991,
and this bug was introduced.

I'm not sure this is caused by the failure of auto git-merge or mistaken conflict resolving.
Do you remember something? @k-okada @furushchev

commit 338d9b850623cb614eb5596fba9c6b7ff1e2b9c9
Merge: 8382f6b 778063d
Author: Kei Okada <k-okada@jsk.t.u-tokyo.ac.jp>
Date:   Mon Jan 22 13:00:54 2018 +0900

    Merge branch 'master' into icp-2d

diff --cc jsk_pcl_ros/scripts/install_sample_data.py
index 0a8af1b,8b865d6..8b6618b
--- a/jsk_pcl_ros/scripts/install_sample_data.py
+++ b/jsk_pcl_ros/scripts/install_sample_data.py
@@@ -91,22 -91,14 +91,32 @@@ def main()
  
      download_data(
          pkg_name=PKG,
 +        path='sample/data/pr2_sink.bag.tgz',
 +        url='https://drive.google.com/uc?id=19VujodKsX7EJJwHetqFGCRYz0JBtZQ6h',
 +        md5='9bdc1500610a1a97480cae6fcf261811',
 +        extract=True,
 +        compressed_bags=[
 +            'sample/data/pr2_sink.bag',
 +        ],
 +    )
 +
 +    download_data(
 +        pkg_name=PKG,
 +        path='sample/data/kettle.pcd',
 +        url='https://drive.google.com/uc?id=1MpQ3MK3D5VTlmj--r9dFPrfyLPQU7LO0',
 +        md5='87579bdbb5f87a058697ace16887e37f',
 +        extract=False,
 +    )
 +
++    download_data(
+         path='sample/data/sample_door_handle_detector.bag',
+         url='https://drive.google.com/uc?id=0B4ysRIwB7GryMGxCTUI0MHhqWFk',
+         md5='f702e012730db7aaf01b9868280d8bca',
+         compressed_bags=[
+             'sample/data/sample_door_handle_detector.bag',
+         ],
+     )
+ 
+ 
  if __name__ == '__main__':
      main()

[wkentaro]

I was surprised that some PRs are merged with passed travis tests after this bug was introduced.
But I found that the bag file which cannot be installed because of this bug has not been used by tests and only used by sample.