Move ReuseAddress to server options.

Source/MQTTnet/Server/MqttServerTcpEndpointBaseOptions.cs

@@ -19,5 +19,10 @@ namespace MQTTnet.Server
         public IPAddress BoundInterNetworkAddress { get; set; } = IPAddress.Any;
 
         public IPAddress BoundInterNetworkV6Address { get; set; } = IPAddress.IPv6Any;
+
+        /// <summary>
+        /// This requires admin permissions on Linux.
+        /// </summary>
+        public bool ReuseAddress { get; set; }
     }
 }