QPIDJMS-9: flesh out support for incoming TextMessages using amqp data section, add unit testing of text messages and tweak the *Test class heirarchy and setUp overridding to ease examination of console output

git-svn-id: https://svn.apache.org/repos/asf/qpid/jms/trunk@1545692 13f79535-47bb-0310-9956-ffa450edef68