Set the name of the context to be used when executing queries.
This option is specially useful when authenticating users based on names that don't use a X.500 format such as plainUser.
In this case, you must also provide
#setRdnIdentifier(String) with the attribute name that contains the user name.
If the names used to authenticate users are based on the X.500 format, this configuration can be suppressed.
Please note that by using this option the realm is able to authenticate users based on their simple or X.500 names.