@Override
    public void logApplicationPackage(Level level, String message) {
        LOG.info("ProvisionLogger application " + level + ": " + message);
        applicationLog.add(level + ": " + message);
    }
A logger which remembers all messages logged in addition to writing them to standard out.

@author bratseth
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/testutils/InMemoryProvisionLogger.java