Review Fix - vtn app

Change-Id: I9e1b5031602cb3678a3a8777bab3b2ec8a8a7d48
diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetCreateCommand.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetCreateCommand.java
index 5623640..de8cfe5 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetCreateCommand.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetCreateCommand.java
@@ -98,7 +98,7 @@
     protected void execute() {
         SubnetService service = get(SubnetService.class);
         if (id == null || networkId == null || tenantId == null) {
-            print(null, "id,networkId,tenantId can not be null");
+            print("id,networkId,tenantId can not be null");
             return;
         }
         Subnet subnet = new DefaultSubnet(SubnetId.subnetId(id), subnetName,
diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetUpdateCommand.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetUpdateCommand.java
index b0578a1..c76ca5b 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetUpdateCommand.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/cli/subnet/SubnetUpdateCommand.java
@@ -98,7 +98,7 @@
     protected void execute() {
         SubnetService service = get(SubnetService.class);
         if (id == null || networkId == null || tenantId == null) {
-            print(null, "id,networkId,tenantId can not be null");
+            print("id,networkId,tenantId can not be null");
             return;
         }
         Subnet subnet = new DefaultSubnet(SubnetId.subnetId(id), subnetName,