0-9-1 improvements

Unsupported properties now throw an exception instead of returning meaningless defaults
dtx methods are now unsupported instead of notimplement-ed
HandleConnectionOpenOk now takes a meaningless knownhosts parameter

Author: Emile Joubert

projects/client/Apigen/src/apigen/Apigen.cs

@@ -857,7 +857,7 @@ public void EmitContentHeaderFactory(MethodInfo method) {
 	    EmitLine("    {");
         if (Attribute(method, typeof(AmqpUnsupportedAttribute)) != null)
         {
-            EmitLine(String.Format("      return default({0});", method.ReturnType));
+            EmitLine(String.Format("      throw new UnsupportedMethodException(\"" + method.Name + "\");"));
         }
         else
         {

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

@@ -386,11 +386,11 @@ BasicGetResult BasicGet(string queue,
         void TxRollback();
 
         ///<summary>(Spec method) Enable DTX mode for this session.</summary>
-        [AmqpMethodDoNotImplement("RabbitMQ.Client.Framing.v0_9_1")]
+        [AmqpUnsupported("RabbitMQ.Client.Framing.v0_9_1")]
         void DtxSelect();
 
         ///<summary>(Spec method)</summary>
-        [AmqpMethodDoNotImplement("RabbitMQ.Client.Framing.v0_9_1")]
+        [AmqpUnsupported("RabbitMQ.Client.Framing.v0_9_1")]
         void DtxStart(string dtxIdentifier);
 
         ///<summary>Close this session.</summary>
@@ -701,7 +701,7 @@ void _Private_ConnectionOpen(string virtualHost,
                                      bool insist);
 
         ///<summary>Handle an incoming Connection.OpenOk.</summary>
-        void HandleConnectionOpenOk([AmqpUnsupported("RabbitMQ.Client.Framing.v0_9_1")]
+        void HandleConnectionOpenOk([AmqpFieldMapping("RabbitMQ.Client.Framing.v0_9_1", "reserved1")]
                                     string knownHosts);
 
         ///<summary>Handle an incoming Connection.Redirect.</summary>

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

@@ -146,8 +146,8 @@ public event CallbackExceptionEventHandler CallbackException
                     m_callbackException -= value;
                 }
             }
-        }
-
+        }
+
         public IBasicConsumer DefaultConsumer { get; set; }
 
         public ISession m_session;
@@ -806,8 +806,8 @@ public abstract void BasicReject(ulong deliveryTag,
         public abstract void TxCommit();
         public abstract void TxRollback();
 
-        public virtual void DtxSelect() { }
-        public virtual void DtxStart(string dtxIdentifier) { }
+        public abstract void DtxSelect();
+        public abstract void DtxStart(string dtxIdentifier);
 
         void IDisposable.Dispose()
         {