Concert usage Issues in slow network environment

[dwlee]

Tested with 0.5sec latency robot.

• Pending -> Uninvited([Conductor] transition error rocon_concert#299, Improve conductor graph state machine rocon_concert#302)
• Joinging -> Invited([Conductor] transition error rocon_concert#299, Improve conductor graph state machine rocon_concert#302)
• Client cannot connect to hub (https://github.com/robotics-in-concert/rocon_multimaster/blob/indigo/rocon_hub_client/src/rocon_hub_client/hub_client.py#L92) (robotics-in-concert/rocon_multimaster@e025d91)
• Adding flip rules before removing previous flip rules (Do not send flip request after adding flip rule in robot rocon_multimaster#299)
• Release issue requested resource by scheduler because of watchdog timeout in slow network

[jihoonl]

robotics-in-concert/rocon_app_platform#296
robotics-in-concert/rocon_app_platform#297