Fixed noSuchKey error (#407)

Problem: "NoSuchKey" error was returning when tried copyObject API after applying valid IAM policy on IAM user.

Solution: Previously in copy object API it was considering owner of destination bucket as "user id" and not the actual owner of the bucket. Fixed that by changing owner as destination bucket owner.

Signed-off-by: shraddhaghatol <shraddha.j.ghatol@seagate.com>

src/rgw/rgw_sal_motr.cc

@@ -2396,10 +2396,11 @@ int MotrObject::copy_object_same_zone(RGWObjectCtx& obj_ctx,
     req_id = *tag;
   }
 
+  struct req_state* s = static_cast<req_state*>(obj_ctx.get_private());
   // prepare write op
   std::shared_ptr<rgw::sal::Writer> dst_writer = store->get_atomic_writer(dpp, y,
         dest_object->clone(),
-        user->get_id(), obj_ctx,
+        s->bucket_owner.get_id(), obj_ctx,
         &dest_placement, olh_epoch, req_id);
 
   rc = dst_writer->prepare(y);
@@ -2450,7 +2451,6 @@ int MotrObject::copy_object_same_zone(RGWObjectCtx& obj_ctx,
   }
 
   //Set object tags based on tagging-directive
-  struct req_state* s = static_cast<req_state*>(obj_ctx.get_private());
   auto tagging_drctv = s->info.env->get("HTTP_X_AMZ_TAGGING_DIRECTIVE");
 
   bufferlist tags_bl;