Add support for chaning passwords

MQTTnet.Core/ManagedClient/IManagedMqttClientOptions.cs

@@ -10,7 +10,5 @@ namespace MQTTnet.Core.ManagedClient
         TimeSpan AutoReconnectDelay { get; }
 
         IManagedMqttClientStorage Storage { get; }
-
-        Func<IManagedMqttClientOptions, string> PasswordProvider { get; }
     }
 }

MQTTnet.Core/ManagedClient/ManagedMqttClient.cs

@@ -6,7 +6,6 @@ using System.Threading;
 using System.Threading.Tasks;
 using MQTTnet.Core.Client;
 using MQTTnet.Core.Exceptions;
-using MQTTnet.Core.Packets;
 using MQTTnet.Core.Protocol;
 using Microsoft.Extensions.Logging;
 
@@ -277,7 +276,6 @@ namespace MQTTnet.Core.ManagedClient
 
             try
             {
-                _options.PasswordProvider?.Invoke(_options);
                 await _mqttClient.ConnectAsync(_options.ClientOptions).ConfigureAwait(false);
                 return ReconnectionResult.Reconnected;
             }

MQTTnet.Core/ManagedClient/ManagedMqttClientOptions.cs

@@ -10,8 +10,5 @@ namespace MQTTnet.Core.ManagedClient
         public TimeSpan AutoReconnectDelay { get; set; } = TimeSpan.FromSeconds(5);
 
         public IManagedMqttClientStorage Storage { get; set; }
-
-        public Func<IManagedMqttClientOptions, string> PasswordProvider { get; set; }
-
     }
 }