Change python function name syntax to groovy camelCase

Change-Id: I3845c4da0ceea3508a2c5d6005d899c91e979785
diff --git a/jjb/pipeline/voltha/playground/physical-build.groovy b/jjb/pipeline/voltha/playground/physical-build.groovy
index 44a17ac..b9677c3 100644
--- a/jjb/pipeline/voltha/playground/physical-build.groovy
+++ b/jjb/pipeline/voltha/playground/physical-build.groovy
@@ -74,7 +74,7 @@
     {
 	stage('IAM')
 	{
-	    String iam = get_iam('main')
+	    String iam = getIam('main')
             println("** ${iam}: ENTER")
             println("** ${iam}: LEAVE")
 	}