osd: search for unfound on osds in might_have_unfound
osd: search for unfound on osds in might_have_unfound

We were looking at 'up', which is just the set of OSDs we should be on in
the current epoch; nothing to do with where the objects might be found.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph