(hironx.py) Start ROS_Client in addition to RTM client (HIRONX).

This is small, NOT complete answer to the discussion in https://github.com/start-jsk/rtmros_hironx/issues/236. 

More to come later on but this PReq itself is ready for the review.

With this change, users can use `ROS_Client` on ipython terminal like:
```
IN[1]: robot.goInitial()     <-- Using RTM I/F
IN[2]: ros.go_init()          <-- Using ROS I/F
```