test-utimens: avoid spurious failure Fixes a spurious failure on ext3, with one-second resolution, now that ctime effects are being tested for inequality. * tests/test-chown.h (nap): Factor... * tests/nap.h: ...into new file. * tests/test-lchown.h (nap): Avoid duplication. * tests/test-utimens-common.h (nap): Use shared implementation, necessary on file systems with 1-second resolution. * modules/chown-tests (Files): Include new file. * modules/fdutimensat-tests (Files): Likewise. * modules/futimens-tests (Files): Likewise. * modules/lchown-tests (Files): Likewise. * modules/openat-tests (Files): Likewise. * modules/utimens-tests (Files): Likewise. * modules/utimensat-tests (Files): Likewise. Signed-off-by: Eric Blake <ebb9@byu.net>