QPID-5911: [Java Broker] Increase default maximum heap size from 1g to 2g

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1612526 13f79535-47bb-0310-9956-ffa450edef68
QPID-5903: Apply json escaping mechanism to virtualhost blueprints used in initial-config.json and test-profiles

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1612530 13f79535-47bb-0310-9956-ffa450edef68