@Override
        public String getName() { return "ldap-username-attribute"; }
The attribute or attributes which identify users. One of these
attributes must be present within each Guacamole user's record in the
LDAP directory. If the LDAP authentication will not be given its own
credentials for querying other LDAP users, this list may contain only
one attribute, and the concatenation of that attribute and the value of
LDAP_USER_BASE_DN must equal the user's full DN.
extensions/guacamole-auth-ldap/src/main/java/org/apache/guacamole/auth/ldap/conf/LDAPGuacamoleProperties.java