Various small fixes

Change-Id: I83802169d0d968f7b88d4be2cedba74b15fdd7da
diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/DefaultRouter.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/DefaultRouter.java
index f31aed1..fc8bbe5 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/DefaultRouter.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/DefaultRouter.java
@@ -55,9 +55,9 @@
                          List<String> routes) {
         this.id = checkNotNull(id, "id cannot be null");
         this.name = routerName;
-        this.adminStateUp = checkNotNull(adminStateUp, "adminStateUp cannot be null");
+        this.adminStateUp = adminStateUp;
         this.status = checkNotNull(status, "status cannot be null");
-        this.distributed = checkNotNull(distributed, "distributed cannot be null");
+        this.distributed = distributed;
         this.externalGatewayInfo = externalGatewayInfo;
         this.gatewayPortId = gatewayPortId;
         this.tenantId = checkNotNull(tenantId, "tenantId cannot be null");
diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/RouterGateway.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/RouterGateway.java
index 27e1473..6aef24e 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/RouterGateway.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/RouterGateway.java
@@ -35,7 +35,7 @@
     private RouterGateway(TenantNetworkId networkId, boolean enableSnat,
                          Set<FixedIp> externalFixedIps) {
         this.networkId = checkNotNull(networkId, "networkId cannot be null");
-        this.enableSnat = checkNotNull(enableSnat, "enableSnat cannot be null");
+        this.enableSnat = enableSnat;
         this.externalFixedIps = checkNotNull(externalFixedIps, "externalFixedIps cannot be null");
     }