When running under mod_perl, the magic code to figure out whether CDBI or
DBIC is being used, and thus set catalyst_user_class to Catalyst::Plugin
::Authentication::Store::DBIC::User::CDBI, is not working, it ends up
with the Store::DBIC::User instead. It seems to work fine under the
catalyst test server however.
Workaround, setting catalyst_user_class manually works fine.
Reported by guy_, on #catalyst.