Way to reproduce issues described in 1893

[jogger]

mkdir test; cd test
echo something > something
echo something > \*

Create torrent test.
Shutdown router.
Simulate data corruption by rm everthing in ~/.i2p/i2psnark.config.d except the config file.
Although torrent is still perfect, rescan of the torrent fails and following bugs appear:

• file something is marked as incomplete
• file "*" is recreated as "_" (works the same with "?" and '"')
• if test does not reside in the snark data dir, all files and directories are recreated in the data dir.

This type of corruption has been observed many times on restart with no participating tunnels or on sudden crashes. Files did reside on ext4 or btrfs, config dir was on ext4. Newer torrents (some days) usually seem to be affected.

Workaround: recreating the torrent from originals works, because the info hash is the same.

[zzz]

see #1893 for resolution