enable run reactive routing without BGP

   Another improment is: if we config interfaces for local subnet
   in network-cfg.json, sdn-ip will classify the traffic correctly

Change-Id: I94d80bc5a7c29b70e6c8546d99b71850cfb3f14d

@@ -305,16 +305,19 @@ public class SdnIpReactiveRouting {
         LocationType dstIpLocationType = getLocationType(dstIp);
         Optional<Interface> srcInterface =
                 interfaceService.getInterfacesByPort(srcConnectPoint).stream().findFirst();
+        Set<ConnectPoint> ingressPoints = config.getBgpPeerConnectPoints();
 
         switch (dstIpLocationType) {
         case INTERNET:
-            if (!srcInterface.isPresent()) {
+            if (srcInterface.isPresent() &&
+                    (!ingressPoints.contains(srcConnectPoint))) {
                 return TrafficType.HOST_TO_INTERNET;
             } else {
                 return TrafficType.INTERNET_TO_INTERNET;
             }
         case LOCAL:
-            if (!srcInterface.isPresent()) {
+            if (srcInterface.isPresent() &&
+                    (!ingressPoints.contains(srcConnectPoint))) {
                 return TrafficType.HOST_TO_HOST;
             } else {
                 // TODO Currently we only consider local public prefixes.

@@ -32,8 +32,8 @@ import java.util.List;
 public class Configuration {
     // We call the BGP routers in our SDN network the BGP speakers, and call
     // the BGP routers outside our SDN network the BGP peers.
-    private List<BgpSpeaker> bgpSpeakers;
-    private List<BgpPeer> peers;
+    private List<BgpSpeaker> bgpSpeakers = Collections.emptyList();
+    private List<BgpPeer> peers = Collections.emptyList();
     private MacAddress virtualGatewayMacAddress;
 
     // All IP prefixes from the configuration are local

@@ -195,7 +195,9 @@ public class RoutingConfigurationImpl implements RoutingConfigurationService {
         }
 
         BgpConfig bgpConfig = configService.getConfig(routerAppId, BgpConfig.class);
-
+        if (bgpConfig == null) {
+            return Collections.emptySet();
+        } else {
             return bgpConfig.bgpSpeakers().stream()
                     .flatMap(speaker -> speaker.peers().stream())
                     .map(peer -> interfaceService.getMatchingInterface(peer))
@@ -203,6 +205,7 @@ public class RoutingConfigurationImpl implements RoutingConfigurationService {
                     .map(intf -> intf.connectPoint())
                     .collect(Collectors.toSet());
         }
+    }
 
     @Override
     public Interface getInterface(ConnectPoint connectPoint) {