Improve naming in fio gnuplot graphs

Use job name and strip the known postfix of files out of the title.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio_generate_plots b/fio_generate_plots
index 4ae1d0a..9b1e1ca 100755
--- a/fio_generate_plots
+++ b/fio_generate_plots
@@ -20,11 +20,12 @@
 	if [ ! -r $i ]; then
 		continue
 	fi
+	PT=$(echo $i | sed s/_bw.log//g)
 	if [ "$PLOT_LINE"x != "x" ]; then
 		PLOT_LINE=$PLOT_LINE", "
 	fi
 
-	PLOT_LINE=$PLOT_LINE"'$i' with lines"
+	PLOT_LINE=$PLOT_LINE"'$i' title '$PT' with lines"
 done
 
 if [ "$PLOT_LINE"x != "x" ]; then
@@ -37,11 +38,12 @@
 	if [ ! -r $i ]; then
 		continue
 	fi
+	PT=$(echo $i | sed s/_slat.log//g)
 	if [ "$PLOT_LINE"x != "x" ]; then
 		PLOT_LINE=$PLOT_LINE", "
 	fi
 
-	PLOT_LINE=$PLOT_LINE"'$i' with lines"
+	PLOT_LINE=$PLOT_LINE"'$i' title '$PT' with lines"
 done
 
 if [ "$PLOT_LINE"x != "x" ]; then
@@ -54,11 +56,12 @@
 	if [ ! -r $i ]; then
 		continue
 	fi
+	PT=$(echo $i | sed s/_clat.log//g)
 	if [ "$PLOT_LINE"x != "x" ]; then
 		PLOT_LINE=$PLOT_LINE", "
 	fi
 
-	PLOT_LINE=$PLOT_LINE"'$i' with lines"
+	PLOT_LINE=$PLOT_LINE"'$i' title '$PT' with lines"
 done
 
 if [ "$PLOT_LINE"x != "x" ]; then