Force SIPA_SECRET_KEY to be set
Force SIPA_SECRET_KEY to be set

Also rename WU-specific LDAP settings.

lukasjuhrich/sipa,MarauderXtreme/sipa,lukasjuhrich/sipa,fgrsnau/sipa,agdsn/sipa,MarauderXtreme/sipa,fgrsnau/sipa,agdsn/sipa,agdsn/sipa,lukasjuhrich/sipa,MarauderXtreme/sipa,lukasjuhrich/sipa,agdsn/sipa,fgrsnau/sipa