QPID-4667: Fix for selective message acknowledgement over AMQP 1.0

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1461248 13f79535-47bb-0310-9956-ffa450edef68
QPID-4668: Message is only redelivered if delivery count is greater than 1

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1461249 13f79535-47bb-0310-9956-ffa450edef68