crimson/osd/pg: use rep_op_fut_t

rep_op_fut_t is already used in mutiple files.
Instead of intoducing common types in each relevant file,
future work shoud move this type (and similar) to "crimson_types" file.

Signed-off-by: Matan Breizman <[email protected]>
Signed-off-by: Xuehan Xu <[email protected]>

Author: Matan-B

src/crimson/osd/pg.cc

@@ -890,9 +890,7 @@ void PG::enqueue_delete_for_backfill(
   backfill_state->enqueue_standalone_delete(obj, v, peers);
 }
 
-PG::interruptible_future<
-  std::tuple<PG::interruptible_future<>,
-             PG::interruptible_future<>>>
+PG::interruptible_future<PG::rep_op_fut_t>
 PG::submit_transaction(
   ObjectContextRef&& obc,
   ObjectContextRef&& new_clone,

src/crimson/osd/pg.h

@@ -686,8 +686,9 @@ class PG : public boost::intrusive_ref_counter<
   interruptible_future<MURef<MOSDOpReply>> do_pg_ops(Ref<MOSDOp> m);
 
 public:
-  interruptible_future<
-    std::tuple<interruptible_future<>, interruptible_future<>>>
+  using rep_op_fut_t = std::tuple<interruptible_future<>,
+                                  interruptible_future<>>;
+  interruptible_future<rep_op_fut_t>
   submit_transaction(
     ObjectContextRef&& obc,
     ObjectContextRef&& new_clone,