Changed server crentials property name from password to certificateCredentials

Source/MQTTnet/Implementations/MqttTcpServerAdapter.cs

@@ -48,7 +48,7 @@ namespace MQTTnet.Implementations
                     throw new ArgumentException("TLS certificate is not set.");
                 }
 
-                var tlsCertificate = new X509Certificate2(options.TlsEndpointOptions.Certificate, options.TlsEndpointOptions.Password.Password);
+                var tlsCertificate = new X509Certificate2(options.TlsEndpointOptions.Certificate, options.TlsEndpointOptions.CertificateCredentials.Password);
                 if (!tlsCertificate.HasPrivateKey)
                 {
                     throw new InvalidOperationException("The certificate for TLS encryption must contain the private key.");

Source/MQTTnet/Server/MqttServerOptionsBuilder.cs

@@ -82,10 +82,10 @@ namespace MQTTnet.Server
             return this;
         }
 
-        public MqttServerOptionsBuilder WithEncryptionCertificate(byte[] value, IMqttServerCredentials password = null)
+        public MqttServerOptionsBuilder WithEncryptionCertificate(byte[] value, IMqttServerCredentials credentials = null)
         {
             _options.TlsEndpointOptions.Certificate = value;
-            _options.TlsEndpointOptions.Password = password;
+            _options.TlsEndpointOptions.CertificateCredentials = credentials;
             return this;
         }
 

Source/MQTTnet/Server/MqttServerTlsTcpEndpointOptions.cs

@@ -12,7 +12,7 @@ namespace MQTTnet.Server
 
         public byte[] Certificate { get; set; }
 
-        public IMqttServerCredentials Password { get; set; }
+        public IMqttServerCredentials CertificateCredentials { get; set; }
 
         public bool ClientCertificateRequired { get; set; }