Move iam() into a steps{} block

Change-Id: I9ba71bf2412c566d57837190de86bb46a11ea616
diff --git a/jjb/pipeline/voltha/playground/physical-build.groovy b/jjb/pipeline/voltha/playground/physical-build.groovy
index 856006e..e337f43 100644
--- a/jjb/pipeline/voltha/playground/physical-build.groovy
+++ b/jjb/pipeline/voltha/playground/physical-build.groovy
@@ -40,6 +40,7 @@
      serializable.  Lets see if groovy Throwable wrapper can produce a
      better answer.
      -----------------------------------------------------------------------
+     */
 
     try
     {