a bunch of fixes for error handling (#19627)

- handle errFileCorrupt properly
- micro-optimization of sending done() response quicker
  to close the goroutine.
- fix logger.Event() usage in a couple of places
- handle the rest of the client to return a different error other than
  lastErr() when the client is closed.

cmd/erasure-common.go

@@ -153,6 +153,8 @@ func readMultipleFiles(ctx context.Context, disks []StorageAPI, req ReadMultiple
 		errFileVersionNotFound,
 		io.ErrUnexpectedEOF, // some times we would read without locks, ignore these errors
 		io.EOF,              // some times we would read without locks, ignore these errors
+		context.DeadlineExceeded,
+		context.Canceled,
 	}
 	ignoredErrs = append(ignoredErrs, objectOpIgnoredErrs...)