Bug fixed in RO start_build

Change-Id: I8f68f5a3ab29e627e833c42a5ee443911daadd05
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

jenkins/RO/start_build

-g!/bin/bash
+#!/bin/bash
 #
 #   Licensed under the Apache License, Version 2.0 (the "License");
 #   you may not use this file except in compliance with the License.