client: No longer expect unreferenced chunk count in listhoard()
client: No longer expect unreferenced chunk count in listhoard()

- listhoard(): No longer read unreferenced chunk count from PK, which no
longer produces it

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr