Allow service users to login

LDAP_USER_DN was set to "OU=ESS Users" preventing to find service
account users.
Leaving it empty and relying only on LDAP_BASE_DN allows service users
to login.

JIRA INFRA-1022 #action In Progress

app/settings.py

@@ -43,7 +43,7 @@ ELASTICSEARCH_REFRESH = "false"
 
 LDAP_HOST = "esss.lu.se"
 LDAP_BASE_DN = "DC=esss,DC=lu,DC=se"
-LDAP_USER_DN = "OU=ESS Users"
+LDAP_USER_DN = ""
 LDAP_GROUP_DN = ""
 LDAP_BIND_USER_DN = os.environ.get("LDAP_BIND_USER_DN", "ldapuser")
 LDAP_BIND_USER_PASSWORD = os.environ.get("LDAP_BIND_USER_PASSWORD", "secret")