UBI sensor initialization timeout

Port of the UBI initialization timeout introduced by Shadow for UBI hands.
Be aware this pull request also adds pr2grant in sr_edc_launch which you might not want. Don't hesitate to remove it.


@shadowmanos any preferences regarding that? 

Personally I think we might have to remove it for now, try to get it in ros_ethercat then add it to sr_edc_launch / sr_ronex_launch.