(hrpsys_tools) Add rtm commandline module.

With the risk of similar/same functionality existing somewhere, 

I think unifying the RTM initial process reduces maintenance work and avoids unnecessary errors.

Full example usage can be seen [here](https://github.com/130s/rtmros_nextage/blob/5dd9ac910a4371ae0fbbcc5f7a3830e026905439/nextage_ros_bridge/script/nextage0.5.py), which is going to be pull-requested once this PReq is approved. In a nutshell, in a rtm client script (e.g. `/nextage_ros_bridge/nextage.py`) all you need becomes only a few lines to instantiate your RTM client class:

```
if __name__ == '__main__':
    commandline = rtm_commandline.RtmCommandline('HiroOpen')  # Robot name can be anything.
    args = commandline.init_commandline()
    robot = nxc = nextage_client.NextageClient()
    robot.init(robotname=args.robot, url=args.modelfile)
```