update settings.py so that it works without python-ldap
update settings.py so that it works without python-ldap

mozilla/elmo,Pike/elmo,AdrianGaudebert/elmo,AdrianGaudebert/elmo,mozilla/elmo,AdrianGaudebert/elmo,mozilla/elmo,Pike/elmo,Pike/elmo,Pike/elmo,mozilla/elmo