Refactoring OFDPA pipeline

Remove redundant code and improve log message

Change-Id: I1b8da70abf0c12b71428da0e7e76fe7be793449b
diff --git a/drivers/default/src/main/java/org/onosproject/driver/pipeline/Ofdpa2Pipeline.java b/drivers/default/src/main/java/org/onosproject/driver/pipeline/Ofdpa2Pipeline.java
index 4b2800c..b937762 100644
--- a/drivers/default/src/main/java/org/onosproject/driver/pipeline/Ofdpa2Pipeline.java
+++ b/drivers/default/src/main/java/org/onosproject/driver/pipeline/Ofdpa2Pipeline.java
@@ -412,8 +412,7 @@
 
         if (vidCriterion == null) {
             // NOTE: it is possible that a filtering objective only has ethCriterion
-            log.debug("filtering objective missing dstMac or VLAN, "
-                    + "cannot program VLAN Table");
+            log.debug("filtering objective missing VLAN, cannot program VLAN Table");
         } else {
             /*
              * NOTE: Separate vlan filtering rules and assignment rules