ACL OIDs should share the same type in JCommune and Poulpe

In Spring ACL it bases on class name when saves OID (Object Identity), which means if we pass PoulpeBranch, then it will store this class name in its tables.
Since JCommune works with its own classes, it expects JcBranch in this table. This results in JCommune not being able to read OIDs stored by Poulpe.
In order to fix this we need to save PoulpeBranch as BRANCH keyword, and then JCommune will read the very same keyword.
So in AclManager we need to be able to change the real class name of entity to the shared keyword.