BGP non root user port issue fix.

Change-Id: Ia2de9425807898f4e1e8c04f81475f77b5320c93

@@ -47,6 +47,11 @@
             <groupId>org.osgi</groupId>
             <artifactId>org.osgi.compendium</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-common</artifactId>
+            <version>4.0.36.Final</version>
+        </dependency>
     </dependencies>
 
     <build>

@@ -205,7 +205,7 @@ public class BgpConfig implements BgpCfg {
             lspeer.setSelfInnitConnection(true);
 
             if (lspeer.connectPeer() == null) {
-                connectPeer = new BgpConnectPeerImpl(bgpController, routerid, Controller.getBgpPortNum());
+                connectPeer = new BgpConnectPeerImpl(bgpController, routerid, Controller.BGP_PORT_NUM);
                 lspeer.setConnectPeer(connectPeer);
                 connectPeer.connectPeer();
             }

@@ -159,8 +159,9 @@ public class BgpPeerImpl implements BgpPeer {
      * Send flow specification update message to peer.
      *
      * @param operType operation type
+     * @param routeKey flow rule key
      * @param flowSpec flow specification details
-      * @param wideCommunity for route policy
+     * @param wideCommunity for route policy
      */
     public final void sendFlowSpecUpdateMessageToPeer(FlowSpecOperation operType, BgpFlowSpecRouteKey routeKey,
                                                       BgpFlowSpecNlri flowSpec, WideCommunity wideCommunity) {

@@ -16,7 +16,7 @@
 package org.onosproject.bgp.controller.impl;
 
 import static org.onlab.util.Tools.groupedThreads;
-
+import io.netty.util.internal.PlatformDependent;
 import java.lang.management.ManagementFactory;
 import java.lang.management.RuntimeMXBean;
 import java.net.InetSocketAddress;
@@ -53,9 +53,11 @@ public class Controller {
     public Channel serverChannel;
 
     // Configuration options
-    private static final short BGP_PORT_NUM = 179;
+    protected static final short BGP_PORT_NUM = 179;
+    private static final short BGP_PRIVILEGED_PORT = 1790; // server port used for non root users in linux
     private static final short PORT_NUM_ZERO = 0;
     private static boolean isPortNumSet = false;
+    private static short portNumber = BGP_PORT_NUM;
     private final int workerThreads = 16;
     private final int peerWorkerThreads = 16;
 
@@ -219,6 +221,11 @@ public class Controller {
      */
     public void start() {
         log.info("Started");
+        if (!PlatformDependent.isWindows() && !PlatformDependent.isRoot()) {
+            portNumber = BGP_PRIVILEGED_PORT;
+        } else {
+            portNumber = BGP_PORT_NUM;
+        }
         this.init();
         this.run();
     }
@@ -242,7 +249,8 @@ public class Controller {
         if (isPortNumSet) {
             return PORT_NUM_ZERO;
         }
-        return BGP_PORT_NUM;
+
+        return portNumber;
     }
 
     /**