Update Travis Tests to run platforms in parallel (#11256)

buildroot/share/tests/DUE_tests

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# exit on first failure
+set -e
+
+restore_configs
+opt_set MOTHERBOARD BOARD_RAMPS4DUE_EFB
+opt_enable S_CURVE_ACCELERATION
+opt_set E0_AUTO_FAN_PIN 8
+opt_set EXTRUDER_AUTO_FAN_SPEED 100
+exec_test $1 $2 "RAMPS4DUE_EFB S_CURVE_ACCELERATION"