Add thread number ID to appropriate network commands

The client doesn't necessarily have a 1:1 mapping between jobs
and its internal job representation, so allow it to tell the
various jobs apart.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/stat.h b/stat.h
index 0847246..ce640d9 100644
--- a/stat.h
+++ b/stat.h
@@ -118,6 +118,7 @@
 	char name[FIO_JOBNAME_SIZE];
 	char verror[FIO_VERROR_SIZE];
 	uint32_t error;
+	uint32_t thread_number;
 	uint32_t groupid;
 	uint32_t pid;
 	char description[FIO_JOBNAME_SIZE];