Workaround #3137: Retry SIGINT if it is not received the first time. test_send_signal should not hang anymore on various Linux distributions.
Workaround #3137: Retry SIGINT if it is not received the first time.
test_send_signal should not hang anymore on various Linux distributions.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator