Currently, the multi-repository tests always use a H2 database.
We want to improve the CoreFeature in order to be able to initialize several repositories to test the multi-repository feature in Nuxeo.
All repositories will have the same backend.
An annotation for class could be introduced to control the number of repositories we want.
The CoreSession injection should also handle correctly this aspect, a @Named annotation with the repository name could be used to get the correct session.