Use a class alias for SimpleSAML\Auth\LDAP
Use a class alias for SimpleSAML\Auth\LDAP

Extending the other class served no purpose, so a class alias should be enough. Also, enhance a bit the exception message, and log a warning with our own logger.

Signed-off-by: Jaime Pérez Crespo <97eacf607c7365bcf0d28d984fb632889cc59055@uninett.no>

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