pgbench: Show better progress when loading tuples

Show target number of tuples and percentage in addition to current
number.

contrib/pgbench/pgbench.c

@@ -1420,7 +1420,9 @@ init(bool is_no_vacuum)
 		}
 
 		if (j % 100000 == 0)
-			fprintf(stderr, "%d tuples done.\n", j);
+			fprintf(stderr, "%d of %d tuples (%d%%) done.\n",
+					j, naccounts * scale,
+					j * 100 / (naccounts * scale));
 	}
 	if (PQputline(con, "\\.\n"))
 	{