request sponsor for #4890717 want append-only files.

I have a working prototype where the administrator can put a zfs fs
into "append only" mode by setting the zfs "appendonly" property to
"on" using zfs(1M).

"append only" mode in this case means

1. Applications can only append to any existing files, but cannot
truncate files by creating a new file with the same filename an
existing file, or by writing in a file at an offset other than the end
of the file. (Applications can still create new files)

2. Applications cannot remove existing files/directories.

3. Applications cannot rename/move existing files/directories.

Thanks! I hope this is still wanted. :)


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