Currently, ryu-manager emits traceback messages when killed via KeyboardInterrupt. This patch traps the KeyboardInterrupt, and outputs an appropriate log message instead. Signed-off-by: Victor J. Orlikowski <vjo@duke.edu> Signed-off-by: Alan Fordyce <alan_fordyce@keysight.com> Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>