Merge pull request #1072 from jglick/CpsBodySubContext.toString

Better `CpsBodySubContext.toString`

Author: jglick

plugin/src/main/java/org/jenkinsci/plugins/workflow/cps/CpsBodySubContext.java

@@ -54,10 +54,14 @@ public int hashCode() {
         return 31 * base.hashCode() + node.hashCode();
     }
 
+    @Override
+    public String toString() {
+        return "CpsBodySubContext[" + base + ":" + node.getId()+ "]";
+    }
+
     // Delegation to 'base' from here
 //======================================
 
-
     @Override
     public void onFailure(Throwable t) {
         base.onFailure(t);