message statement
The message statement allows to set up the messages that are
returned to the user with authentication-response packets.
    message {
            [ account-closed string ; ]
            [ password-expired string ; ]
            [ password-expire-warning string ; ]
            [ access-denied string ; ]
            [ realm-quota string ; ]
            [ multiple-login string ; ]
            [ second-login string ; ]
            [ timespan-violation string ; ]
    };
All variables in message block take a string argument. In
string you can use the usual C backslash notation to represent
non-printable characters. The use of %C{} and %R{} sequences
is also allowed (see section Macro Substitution).
account-closed
password-expired
password-expire-warning
password-expire-warning variable in auth block.
See section auth statement. In this string, you can use the %R{Password-Expire-Days}
substitution, to represent the actual number of days left
to the expiration date. The default is
    Password Will Expire in %R{Password-Expire-Days} Days\r\n
access-denied
realm-quota
multiple-login
second-login
multiple-login, which is used when
the user's login limit is 1.
timespan-violation
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