Add handling for unrooted files

Unrooted files should only happen due to a now fixed bug that
would rmdir non-empty directories.
Unrooted files are now re-rooted in lost_found.

This also introduces a mechanism to empty out lost and found at
mount, thus recaliming this space. This option may be controlled
via a compile flag and overridden with a mount option.

Signed-off-by: Charles Manning <cdhmanning@gmail.com>

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