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
diff --git a/web/api/src/main/java/org/onosproject/rest/resources/ConfigProvider.java b/web/api/src/main/java/org/onosproject/rest/resources/ConfigProvider.java
index 2716354..13516bd 100644
--- a/web/api/src/main/java/org/onosproject/rest/resources/ConfigProvider.java
+++ b/web/api/src/main/java/org/onosproject/rest/resources/ConfigProvider.java
@@ -517,13 +517,20 @@
         String portName = text.substring(i + 1);
         DeviceId deviceId = deviceId(text.substring(0, i));
 
-        long portNum = 0L;
         for (Port port : deviceService.getPorts(deviceId)) {
             PortNumber pn = port.number();
             if (pn.name().equals(portName)) {
                 return new ConnectPoint(deviceId, pn);
             }
         }
+
+        long portNum;
+        try {
+            portNum = Long.parseLong(portName);
+        } catch (NumberFormatException e) {
+            portNum = 0;
+        }
+
         return new ConnectPoint(deviceId, portNumber(portNum, portName));
     }