PROTON-223: add messenger-based soak and valgrind tests

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1462216 13f79535-47bb-0310-9956-ffa450edef68
PROTON-279: add test failure regular expression check

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1462234 13f79535-47bb-0310-9956-ffa450edef68