add sonata_admin_orm and sonata_admin_phpcr bundle sets

basing on https://github.com/symfony-cmf/SeoBundle/pull/153#discussion-diff-11888703

i created two more bundle sets and refactored the tests from them. 
But i can't  unfortunately test the new bundle sets i thougt i could with that method, cause the most the bundles in sonata_admin_* arn't available.