rgw:fix for deleting objects name beginning and ending with underscor…

…es of one bucket using POST method of AWS's js sdk.

Fixes: http://tracker.ceph.com/issues/17888

Signed-off-by: zhouruisong 236131368@qq.com

src/rgw/rgw_op.cc

@@ -5202,7 +5202,8 @@ void RGWDeleteMultiObj::execute()
   for (iter = multi_delete->objects.begin();
         iter != multi_delete->objects.end() && num_processed < max_to_delete;
         ++iter, num_processed++) {
-    rgw_obj obj(bucket, *iter);
+    rgw_obj obj(bucket, (*iter).name);
+    obj.set_instance(s->object.instance);
 
     obj_ctx->set_atomic(obj);