Add unified_rw_reporting option

If this is set, then fio will sum and display just a single set
of statistics for any IO type. By default, fio accounts and reports
each data direction separately.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/server.c b/server.c
index 0cc3fad..7ec8531 100644
--- a/server.c
+++ b/server.c
@@ -648,6 +648,7 @@
 
 	dst->kb_base	= cpu_to_le32(src->kb_base);
 	dst->groupid	= cpu_to_le32(src->groupid);
+	dst->unified_rw_rep	= cpu_to_le32(src->unified_rw_rep);
 }
 
 /*
@@ -669,8 +670,10 @@
 
 	p.ts.error	= cpu_to_le32(ts->error);
 	p.ts.groupid	= cpu_to_le32(ts->groupid);
+	p.ts.unified_rw_rep	= cpu_to_le32(ts->unified_rw_rep);
 	p.ts.pid	= cpu_to_le32(ts->pid);
 	p.ts.members	= cpu_to_le32(ts->members);
+	p.ts.unified_rw_rep	= cpu_to_le32(ts->unified_rw_rep);
 
 	for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 		convert_io_stat(&p.ts.clat_stat[i], &ts->clat_stat[i]);