[keycloak-dev] AuthenticationProvider/Link removed

Removed everything associated with it and the authentication/ module too. I also removed RealmModel.getLdapConfig() and representation stuff around that. Finally, i had to disable the keycloak-picketlink-realm project as it depended in RealmModel.getLdapConfig(). -- Bill Burke JBoss, a division of Red Hat http://bill.burkecentral.com