Description of problem:
dtx Rollback does not preserve message order.  

How reproducible:
The test testMultiMessagesDurSubCrash from
org.apache.qpid.test.unit.xa.TopicTest exhibits this behavior. 
The following profile should be used: 
---------------------------------------------------------
broker.version=0-10
broker=${project.root}/../cpp/src/qpidd --data-dir ${build.data} -t
--load-module ${project.root}/../../cppStore/cpp/lib/.libs/libbdbstore.so
--store-async yes --auth no
broker.clean=${project.root}/clean-dir ${build.data}
java.naming.provider.url=${project.root}/test-provider.properties
max_prefetch=0
test.excludes=true
test.excludesfile=${project.root}/myExcludeList
log=info
amqj.logging.level=$log
root.logging.level=$log
log4j.configuration=file://${project.root}/log4j-test.xml
test.fork=no
test.mem=512M
test=*TopicTest
test1=*TopicTest
haltonfailure=no
haltonerror=no
------------------------------------------------------------------

Where myExcludeList contains: 

------------------------------------
org.apache.qpid.test.unit.xa.TopicTest#testMigrateDurableSubscriber
org.apache.qpid.test.unit.xa.TopicTest#testDurSub
org.apache.qpid.test.unit.xa.TopicTest#testDurSubCrash
org.apache.qpid.test.unit.xa.TopicTest#testMultiMessagesDurSub
org.apache.qpid.test.unit.xa.TopicTest#testProducer
org.apache.qpid.test.unit.xa.TopicTest#testRecover
-------------------------------------