hashmap: Remove .consume() has rename .consume_iter() to .consume()

Updated all users of HashMap, HashSet old .consume() to use .consume()
with a for loop.

Since .consume() takes the map or set by value, it needs awkward
extra code to in librusti's use of @mut HashMap, where the map value can
not be directly moved out.

src/libstd/unstable/weak_task.rs

@@ -122,7 +122,7 @@ fn run_weak_task_service(port: Port<ServiceMsg>) {
         }
     }
 
-    do shutdown_map.consume |_, shutdown_chan| {
+    for shutdown_map.consume().advance |(_, shutdown_chan)| {
         // Weak task may have already exited
         shutdown_chan.send(());
     }