Use existing portNamePrefix variable.

Author: ankedia

operator/src/main/java/oracle/kubernetes/operator/helpers/PodStepContext.java

@@ -325,7 +325,7 @@ private String createContainerPortName(List<V1ContainerPort> ports, String name)
       if (index < 10) {
         indexStr = "0" + index;
       }
-      name = getPortNamePrefix(name) + "-" + indexStr;
+      name = portNamePrefix + "-" + indexStr;
     }
     return  name;
   }