Strip call() down to bare syntax, no parameters only a closure body with arguments

Change-Id: I09797d5819e701f76f6cfeb6a4bc2bebd88cd304
diff --git a/jjb/pipeline/voltha/playground/physical-build.groovy b/jjb/pipeline/voltha/playground/physical-build.groovy
index e337f43..fc931d5 100644
--- a/jjb/pipeline/voltha/playground/physical-build.groovy
+++ b/jjb/pipeline/voltha/playground/physical-build.groovy
@@ -100,7 +100,7 @@
         {
             steps
             {
-                iam(this)
+                iam
                 {
                     enter = true
                     label = getIam()
@@ -112,7 +112,7 @@
                     volthaHelmChartsChange: "${volthaHelmChartsChange}",
                 ])
 
-                iam(this)
+                iam
                 {
                     leave = true
                     label = getIam()