hammer cleanup removes snapshots even when retention time is 0 when it ought to have disabled removing snapshots

[YONETANI Tomokazu]

On Fri, Apr 23, 2010 at 01:47:13PM +0530, Siju George wrote:
> The hammer man page says
>              If the snapshots directive has a period of 0 and a retention time
>              of 0 then snapshot generation is disabled, removal of old snap-
>              shots are disabled,

                                   and prunes will use prune-everything.

. .., which is what's done to /tmp, /var/tmp, or /usr/obj by default.