[repoapi] move get_repository function into a new repoapi module
This new module aims to host the function of the new API replacing the old
DBAPI. `get_repository` is still needed hence moved to the new module.
Related to #2503918
from yams.buildobjs import RelationDefinition
class ARelation(RelationDefinition):
subject = 'CWUser'
object = 'CWGroup'