test/regress.h: Increase default timeval tolerance 50 ms -> 100 ms The default timeout tolerance is 50 ms, which causes intermittent failure in many the related tests in arm64 QEMU. See: https://bugzilla.yoctoproject.org/show_bug.cgi?id=14163 (The root cause seems to be a heavy load) Signed-off-by: Yi Fan Yu <yifan.yu@windriver.com>