title: exit pipeline job withou failing
body: <p>In my Jenkins instance I use shared libraries. In my first step I perform a integrity checkout. On the beginning of this checkout I check if there are changes regarding my reopsitory. If there are no changes I want to exit the whole pipeline job WITHOUT changing the build status to unstable.</p>
  
  <p>mainpipeline:</p>
  
  <pre><code>step('checkout'){
       performIntegrityCheckout()
  }
  </code></pre>
  
  <p>performIntegrityCheckout:</p>
  
  <pre><code> //PERFORM INTEGRITY CHECKOUT
   if(changes == "false"){
        //EXIT HERE
   }
  </code></pre>
  
  <p>I tried to use <code>return</code> but this only ends the current closure.
  Any ideas?</p>