shred -u does not work correctly on freebsd

[ajanicij]

test_shred_force is failing on freebsd because shred -u doesn't respect readonly flag.

If file.txt is readonly, shred -u file.txt should fail. That is the purpose of --force: shred -u --force file.txt should change the file permissions to non-readonly and then shred the file. However, on freebsd shred -u file.txt removes the file even when it is readonly.

Currently test_shred_force is skipped for freebsd, but we need to investigate why it fails.

[stale[bot]]

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