02a15b5613
When LUN is disabled, SIM starts returning queued ATIOs/INOTs. But at the same time there can be some ATIOs/INOTs still carrying real new requests. If we free those, SIM may leak some resources, forever expecting for any response from us. So try to be careful, separating ATIOs/INOTs carrying requests which still must be processed, from ATIOs/INOTs completed with errors which can be freed. MFC after: 2 weeks