Remove client disconnected handler from wrong implementation location.

Source/MQTTnet/Server/IMqttServerOptions.cs

@@ -8,7 +8,7 @@ namespace MQTTnet.Server
         /// Gets the client identifier.
         /// Hint: This identifier needs to be unique over all used clients / devices on the broker to avoid connection issues.
         /// </summary>
-        string ClientId { get; set; }
+        string ClientId { get; }
 
         bool EnablePersistentSessions { get; }
 
@@ -23,16 +23,13 @@ namespace MQTTnet.Server
         IMqttServerUnsubscriptionInterceptor UnsubscriptionInterceptor { get; }
         IMqttServerApplicationMessageInterceptor ApplicationMessageInterceptor { get; }
         IMqttServerClientMessageQueueInterceptor ClientMessageQueueInterceptor { get; }
-
+        IMqttServerApplicationMessageInterceptor UndeliveredMessageInterceptor { get; }
+        
         MqttServerTcpEndpointOptions DefaultEndpointOptions { get; }
         MqttServerTlsTcpEndpointOptions TlsEndpointOptions { get; }
 
         IMqttServerStorage Storage { get; }
 
         IMqttRetainedMessagesManager RetainedMessagesManager { get; }
-
-        IMqttServerApplicationMessageInterceptor UndeliveredMessageInterceptor { get; set; }
-
-        IMqttServerClientDisconnectedHandler ClientDisconnectedInterceptor { get; set; }
     }
 }

Source/MQTTnet/Server/MqttClientSessionsManager.cs

@@ -13,7 +13,6 @@ using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using MQTTnet.Client.Disconnecting;
-using OperationCanceledException = System.OperationCanceledException;
 
 namespace MQTTnet.Server
 {

Source/MQTTnet/Server/MqttServerOptions.cs

@@ -34,12 +34,10 @@ namespace MQTTnet.Server
 
         public IMqttServerUnsubscriptionInterceptor UnsubscriptionInterceptor { get; set; }
 
+        public IMqttServerApplicationMessageInterceptor UndeliveredMessageInterceptor { get; set; }
+
         public IMqttServerStorage Storage { get; set; }
 
         public IMqttRetainedMessagesManager RetainedMessagesManager { get; set; } = new MqttRetainedMessagesManager();
-
-        public IMqttServerApplicationMessageInterceptor UndeliveredMessageInterceptor { get; set; }
-
-        public IMqttServerClientDisconnectedHandler ClientDisconnectedInterceptor { get; set; }
     }
 }

Source/MQTTnet/Server/MqttServerOptionsBuilder.cs

@@ -170,19 +170,7 @@ namespace MQTTnet.Server
             _options.ConnectionValidator = new MqttServerConnectionValidatorDelegate(value);
             return this;
         }
-
-        public MqttServerOptionsBuilder WithDisconnectedInterceptor(IMqttServerClientDisconnectedHandler value)
-        {
-            _options.ClientDisconnectedInterceptor = value;
-            return this;
-        }
-
-        public MqttServerOptionsBuilder WithDisconnectedInterceptor(Action<MqttServerClientDisconnectedEventArgs> value)
-        {
-            _options.ClientDisconnectedInterceptor = new MqttServerClientDisconnectedHandlerDelegate(value);
-            return this;
-        }
-
+        
         public MqttServerOptionsBuilder WithApplicationMessageInterceptor(IMqttServerApplicationMessageInterceptor value)
         {
             _options.ApplicationMessageInterceptor = value;