Fix dialyzer issue with binary vs. iolist.

Author: Doug Rohrer

src/riak_repl_pb_get.erl

@@ -68,7 +68,7 @@ process(#rpbreplgetclusteridreq{}, State) ->
     ClusterId = lists:flatten(
         io_lib:format("~p", [riak_core_ring:cluster_name(Ring)])),
     lager:debug("Repl PB: returning cluster id ~p", [ClusterId]),
-    {reply, #rpbreplgetclusteridresp{cluster_id = ClusterId}, State};
+    {reply, #rpbreplgetclusteridresp{cluster_id = list_to_binary(ClusterId)}, State};
 %% @doc Return Key/Value pair, derived from the KV version
 process(#rpbreplgetreq{bucket=B, key=K, r=R0, pr=PR0, notfound_ok=NFOk,
                        basic_quorum=BQ, if_modified=VClock,