1) ensure openejb modules are started with the right application classloader, and 2) switch to activemq 5.4.3 to avoid possible licensing issues (AMQ-3491)

git-svn-id: https://svn.apache.org/repos/asf/geronimo/server/branches/3.0@1465826 13f79535-47bb-0310-9956-ffa450edef68