Fix tests where files are not closed

[peter-lawrey]

No description provided.

[peter-lawrey]

Fix the tests so the error reporting open files doesn't need to be logged.

    @After
    public void checkMappedFiles() {
        try {
            MappedFile.checkMappedFiles();
        } catch (AssertionError e) {
            // TODO Fix this, https://github.com/OpenHFT/Chronicle-Queue/issues/680
            e.printStackTrace();
        }
    }