Remove more 0-8isms

Author: michaelklishin

projects/client/RabbitMQ.Client/src/client/api/IModel.cs

@@ -497,15 +497,6 @@ BasicGetResult BasicGet(string queue,
         ///transaction.</summary>
         void TxRollback();
 
-        ///<summary>(Spec method) Enable DTX mode for this session.
-        /// (unsupported in AMQP 0-9-1)</summary>
-        [AmqpUnsupported("RabbitMQ.Client.Framing.v0_9_1")]
-        void DtxSelect();
-
-        ///<summary>(Spec method, unsupported in AMQP 0-9-1)</summary>
-        [AmqpUnsupported("RabbitMQ.Client.Framing.v0_9_1")]
-        void DtxStart(string dtxIdentifier);
-
         ///<summary>Close this session.</summary>
         ///<remarks>
         ///If the session is already closed (or closing), then this

projects/client/RabbitMQ.Client/src/client/impl/ModelBase.cs

@@ -1288,9 +1288,6 @@ public abstract void BasicNack(ulong deliveryTag,
         public abstract void TxCommit();
         public abstract void TxRollback();
 
-        public abstract void DtxSelect();
-        public abstract void DtxStart(string dtxIdentifier);
-
         void IDisposable.Dispose()
         {
             Close();