Commits on Feb 16, 2017

1. [roslaunch] Indicating <node> tag when it is actually a <test> tag is… …

   … confusing.
   
   For example, [this warning msg](https://travis-ci.org/wg-perception/people/jobs/202019288#L3737) (in this [PR](wg-perception/people#49)):
   
    ```
    * WARN: unrecognized 'group' tag in <node> tag. Node xml is <test name="$(arg testnode_name)" pkg="rostest" test-name="hztest_test" type="hztest">
       <group unless="$(arg expected_success)">
         <node args="-r 0.5 $(find face_detector)/test/face_detector_noface_test_diamondback.bag" name="play" pkg="rosbag" type="play"/>
         <param name="hz" value="0.0"/>
       </group>
   ```
   
   This is confusing because the tag in question is actually `<test>`, not `<node>`. Although the warning message refers to the exact <test> tag, I didn't try to read it because I was told the issue is with <node>, not <test>.
   
   With this PR the message becomes a bit verbose but hope the readers get better idea.

   

   130s committed Feb 16, 2017
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