stats_vty: also show rate counter group name (if present)

Change-Id: I358f52e81a85f041fc21960634d04d18e7883dd5
diff --git a/src/vty/stats_vty.c b/src/vty/stats_vty.c
index 630ee32..d5d3292 100644
--- a/src/vty/stats_vty.c
+++ b/src/vty/stats_vty.c
@@ -555,7 +555,10 @@
 static int rate_ctr_group_handler(struct rate_ctr_group *ctrg, void *sctx_)
 {
 	struct vty *vty = sctx_;
-	vty_out(vty, "%s %u:%s", ctrg->desc->group_description, ctrg->idx, VTY_NEWLINE);
+	vty_out(vty, "%s %u", ctrg->desc->group_description, ctrg->idx);
+	if (ctrg->name != NULL)
+		vty_out(vty, " (%s)", ctrg->name);
+	vty_out(vty, ":%s", VTY_NEWLINE);
 	vty_out_rate_ctr_group_fmt(vty, "%25n: %10c (%S/s %M/m %H/h %D/d) %d", ctrg);
 	return 0;
 }