[jsk_tools] add ROS param set test

[knorth55]

Usage

name: param name
timeout: timeout [second]
expected: expected value

<test test-name="rosparam_set"
      pkg="jsk_tools" type="test_rosparam_set.py">
  <rosparam>
    params
      - name: /test_param
        expected: true
        timeout: 10
  </rosparam>
<test>

[wkentaro]

I found we can use list of dict instead of using ~param_0, ... ~param_N.
Please refer to https://github.com/ros/ros_comm/blob/lunar-devel/tools/rostest/nodes/publishtest#L41 .

And please consider sending PR to rostest when you have tim.
It has node for single param test: https://github.com/ros/ros_comm/blob/lunar-devel/tools/rostest/nodes/paramtest

[knorth55]

updated!

<test test-name="rosparam_set"
      pkg="jsk_tools" type="test_rosparam_set.py">
  <rosparam>
    params
      - name: /test_param
        expected: true
        timeout: 10
  </rosparam>
<test>