#012992: LDAP registerFetchData() does not work with normal case attributes (eg. 'displayName')

When trying to retrieve LDAP attributes like displayName during authentication, those attributes must be declared in lowercase in order to work, eg this will work:

$filter = new ezcAuthenticationLdapFilter( /*...*/ );
$filter->registerFetchData( array( 'displayname' ) );

while this won't work:

$filter = new ezcAuthenticationLdapFilter( /*...*/ );
$filter->registerFetchData( array( 'displayName' ) );

The function should support the normal case attributes ('displayName') or both (normal case and lowercase).

Operating System: Linux
PHP Version: any
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