Fix bug that inconsistency happens in long value and name in PortNumber

The case is like the underlying name is "2", but long value is 0.

This fix relates to ONOS-2082.

Change-Id: I702ed91563296d38980dc6895fafb18aecaa26f8

@@ -517,13 +517,20 @@ class ConfigProvider implements DeviceProvider, LinkProvider, HostProvider {
         String portName = text.substring(i + 1);
         String portName = text.substring(i + 1);
         DeviceId deviceId = deviceId(text.substring(0, i));
         DeviceId deviceId = deviceId(text.substring(0, i));
 
 
-        long portNum = 0L;
         for (Port port : deviceService.getPorts(deviceId)) {
         for (Port port : deviceService.getPorts(deviceId)) {
             PortNumber pn = port.number();
             PortNumber pn = port.number();
             if (pn.name().equals(portName)) {
             if (pn.name().equals(portName)) {
                 return new ConnectPoint(deviceId, pn);
                 return new ConnectPoint(deviceId, pn);
             }
             }
         }
         }
+
+        long portNum;
+        try {
+            portNum = Long.parseLong(portName);
+        } catch (NumberFormatException e) {
+            portNum = 0;
+        }
+
         return new ConnectPoint(deviceId, portNumber(portNum, portName));
         return new ConnectPoint(deviceId, portNumber(portNum, portName));
     }
     }