Add a delay after arming the robot
Add a delay after arming the robot

Added a small delay after arming the robot to wait for the service
call to complete. This attempts to avoid an error where the next
service call throws an exception because the current one has not
finished.

ProgrammingRobotsStudyGroup/robo_magellan,ProgrammingRobotsStudyGroup/robo_magellan,ProgrammingRobotsStudyGroup/robo_magellan,ProgrammingRobotsStudyGroup/robo_magellan