Quadruped joystick teleop: say something when service call failed #1930
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chery-picked from https://github.com/k-okada/jsk_robot/commits/4cbe88a883734d16a9582414bde1a53f16648f98/jsk_robot_common/jsk_robot_startup/src/quadruped_joystick_teleop.cpp
cc: @mqcmd196 @sktometometo