OF-1362: websocket plugin has been broken since Openfire 4.1.4.

This PR implements the missing code and fixes the issue

   @Override
   public ConnectionConfiguration getConfiguration()
   {
       // TODO Here we run into an issue with the ConnectionConfiguration introduced in Openfire 4:
       //      it is not extensible in the sense that unforeseen connection types can be added.
       //      For now, null is returned, as this object is likely to be unused (its lifecycle is
       //      not managed by a ConnectionListener instance).
       return null;
   }

src/plugins/websocket/plugin.xml

@@ -8,8 +8,8 @@
     <name>Openfire WebSocket</name>
     <description>Provides WebSocket support for Openfire.</description>
     <author>Tom Evans</author>
-    <version>1.2.0</version>
-    <date>06/09/2017</date>
+    <version>1.2.1</version>
+    <date>06/30/2017</date>
     <url>https://tools.ietf.org/html/rfc7395</url>
     <minServerVersion>4.1.5</minServerVersion>
 </plugin>

src/plugins/websocket/src/java/org/jivesoftware/openfire/websocket/WebSocketConnection.java

@@ -18,11 +18,14 @@ package org.jivesoftware.openfire.websocket;
 import java.net.InetSocketAddress;
 
 import org.dom4j.Namespace;
+import org.jivesoftware.openfire.*;
 import org.jivesoftware.openfire.PacketDeliverer;
 import org.jivesoftware.openfire.auth.UnauthorizedException;
 import org.jivesoftware.openfire.net.VirtualConnection;
 import org.jivesoftware.openfire.nio.OfflinePacketDeliverer;
 import org.jivesoftware.openfire.spi.ConnectionConfiguration;
+import org.jivesoftware.openfire.spi.ConnectionManagerImpl;
+import org.jivesoftware.openfire.spi.ConnectionType;
 import org.xmpp.packet.Packet;
 import org.xmpp.packet.StreamError;
 
@@ -35,10 +38,13 @@ public class WebSocketConnection extends VirtualConnection
     private InetSocketAddress remotePeer;
     private XmppWebSocket socket;
     private PacketDeliverer backupDeliverer;
+    private ConnectionConfiguration configuration;
+    private ConnectionType connectionType;
 
     public WebSocketConnection(XmppWebSocket socket, InetSocketAddress remotePeer) {
     	this.socket = socket;
     	this.remotePeer = remotePeer;
+    	this.connectionType = ConnectionType.SOCKET_C2S;
     }
 
 	@Override
@@ -67,7 +73,7 @@ public class WebSocketConnection extends VirtualConnection
         deliverRawText(new StreamError(StreamError.Condition.system_shutdown).toXML());
     	close();
     }
-    
+
 	@Override
     public void deliver(Packet packet) throws UnauthorizedException
     {
@@ -112,15 +118,14 @@ public class WebSocketConnection extends VirtualConnection
         return backupDeliverer;
     }
 
-    @Override
-    public ConnectionConfiguration getConfiguration()
-    {
-        // TODO Here we run into an issue with the ConnectionConfiguration introduced in Openfire 4:
-        //      it is not extensible in the sense that unforeseen connection types can be added.
-        //      For now, null is returned, as this object is likely to be unused (its lifecycle is
-        //      not managed by a ConnectionListener instance).
-        return null;
-    }
+	@Override
+	public ConnectionConfiguration getConfiguration() {
+		if (configuration == null) {
+			final ConnectionManagerImpl connectionManager = ((ConnectionManagerImpl) XMPPServer.getInstance().getConnectionManager());
+			configuration = connectionManager.getListener( connectionType, true ).generateConnectionConfiguration();
+		}
+		return configuration;
+	}
 
     @Override
 	public boolean isCompressed() {