ltp-guf-test: @sanvito-custom-setup.sh@ script (refs #39957)

* added calls to shutdown customer application
* moved mount-call to the end to gain some time (USB-power on to successful mount takes variable amounts of time)
* added call to disable screensaver

Change-Id: Iacc91ee495689e2e8f2d93a31cb52cb31f9d5040
Note: This setup-script should be called on each boot before starting the @bit@ testsuite but only after the customer application has started completely (dialog to chose language is visible on screen). If the script is started before the customer app is fully started, some calls may not work, the USB-stick may fail to mount continuously, the @bit@ runtimes may increase significantly or the system may reboot automatically after some time.

runtest/sanvito-custom-setup.sh

@@ -4,4 +4,8 @@ ln -s /usr/lib/libGL.so.1.2.0 /opt/lib/libGL.so.1.2
 export PATH=$PATH:/opt/ltp/testcases/bin
 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/lib
 export DISPLAY=:0
-ubus call board enable '{"name": "usb"}'; mount -o remount,rw /tmp/E26F-BE71;
+ubus call board enable '{"name": "usb"}';
+systemctl disable qtwebengine mbsa
+systemctl stop qtwebengine mbsa
+xset s off -dpms
+mount -o remount,rw /tmp/E26F-BE71;