refactor to no longer use right join

[lsmith77]

right join are currently not supported by all RDBMS and so Jackalope Doctrine DBAL may fail due to its current implementation

https://github.com/doctrine/phpcr-odm/blob/master/lib/Doctrine/ODM/PHPCR/Translation/TranslationStrategy/ChildTranslationStrategy.php#L167

will lead to a right join in Doctrine DBAL https://github.com/jackalope/jackalope-doctrine-dbal/blob/master/src/Jackalope/Transport/DoctrineDBAL/Query/QOMWalker.php#L322

of course we could also try to convert right joins to left joins in jackalope Doctrine DBAL