title: Jenkins Label parameter Issue
body: <p>I created 4 slaves in my Jenkins and give a same label "test".Now I want when I will give the test label the deployment should run on all the slaves which is having the label test but unfortunately it is not working.while I give the test label it shows all the nodes which is associated with them but it doesn't execute the job on all slaves just only one.</p>
  
  <p>The first picture shows how I am defining the Label parameter in the jenkins job.it shows Run on all nodes matching the label</p>
  
  <p><img src="https://i.stack.imgur.com/az3ml.png" alt="enter image description here"></p>
  
  <p>The second pic shows while I am giving test in deployeLayer it shows all the nodes but after executing it this doesn't run the job on all matching nodes.</p>
  
  <p><img src="https://i.stack.imgur.com/REWqo.png" alt="enter image description here"></p>
  
  <p>Can someone tell me if I am missing something</p>
  
  <p>I am using the below version 
  <strong>Jenkins ver.</strong> 1.558
  <strong>Node and Label parameter plugin</strong> = 1.5.1</p>