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Failpoint is used to control the fail during API call when testing, especially the API is complicated like CRI-RunPodSandbox. It can help us to test the unexpected behavior without mock. The control design is based on freebsd fail(9), but simpler. REF: https://www.freebsd.org/cgi/man.cgi?query=fail&sektion=9&apropos=0&manpath=FreeBSD%2B10.0-RELEASE Signed-off-by: Wei Fu <fuweid89@gmail.com>