I can enable either LdapPrimaryAuthenticationProvider or
LocalPasswordPrimaryAuthenticationProvider, but not both. I can switch
the authentication method by changing the value for the 'sort' key
(LocalPasswordPrimaryAuthenticationProvider has 'sort' => 100), but I
couldn't figure out how to allow both LDAP and local accounts.
I tried to set 'authoritative' => true, and I also tried it as false,
but none of them seem to work.