Ceph » crimson

right now, historic ops and historic slow ops all placed in OperationTypeCode::historic_client_request op_list, use last_of_recents iter mark division line;
there have some problem:
1. because op_list is not a sorted list, so dump_historic_slow_ops command will show all the historic client_request, just sorted by op duration;
2. OSDOperationRegistry::num_slow_ops not really represent slow ops number, it always equal local_conf()->osd_op_history_slow_op_size(20 default) when total op number greater than 40;
3. dump_historic_slow_ops or dump_historic_ops will output (local_conf()->osd_op_history_op_size + local_conf()->osd_op_history_slow_op_size) ops;

I will try fix this