Change error message when RR times out

When a quorum request detects a checksum mismatch, it then reads the data to repair the mismatch by issuing a request at CL.ALL to the same endpoints (SP.fetchRows) If this request in turn times out, this delivers a TOE to the client with a misleading message that mentions CL.ALL, possibly causing them to think the request has gone cross-DC when it has not, it was just slow due to timing out.