This commit's edit to riak_kv_stat.erl uses a preflist of length 1, which I suppose would be fine for its use.  But riak_kv_status.erl uses a (usually) longer preflist in `vnode_status/0` at https://github.com/basho/riak_kv/blob/a5a5e8c988defd319406fc4fc81ff21ad40f6e74/src/riak_kv_status.erl#L51  ... I'm wondering that it's probably not a good idea to both return a non-list and also to stop receiving other status results?  The `lists:foldl/3` call at line 70 will not like a non-list. ... Hrm, but to keep track of the indexes that have responded (and to put the index # into the {Index#, StatusPropListThingie} tuple), the `{error, overload}` message will need an index number in it.  And then that ripples out to touch more code?