When a producer target disconnects and the producer was in the process of dispatching to him, make sure we ack the in process delivery so that the producer un-blocks.

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-apollo/trunk@1489129 13f79535-47bb-0310-9956-ffa450edef68
Port a possible fix from ActiveMQ

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-apollo/trunk@1489130 13f79535-47bb-0310-9956-ffa450edef68