ldap_default_authtok_type now defaults to "password" if it is not mentioned in sssd.conf

<snip>
(Thu May 26 17:09:49 2011) [sssd[be[AD]]] [dp_get_options] (6): Option ldap_default_bind_dn has value cn=Administrator,cn=Users,dc=sssdad,dc=com
(Thu May 26 17:09:49 2011) [sssd[be[AD]]] [dp_get_options] (6): Option ldap_default_authtok_type has value password
(Thu May 26 17:09:49 2011) [sssd[be[AD]]] [dp_get_options] (6): Option ldap_default_authtok has a binary value.

</snip>

Verified functionality with correct & incorrect passwords in "ldap_default_authtok".

Verified in version:
# rpm -qi sssd | head
Name        : sssd                         Relocations: (not relocatable)
Version     : 1.5.1                             Vendor: Red Hat, Inc.
Release     : 35.el5                        Build Date: Wed 25 May 2011 08:03:59 PM IST
Install Date: Thu 26 May 2011 03:52:52 PM IST      Build Host: x86-008.build.bos.redhat.com
Group       : Applications/System           Source RPM: sssd-1.5.1-35.el5.src.rpm
Size        : 3486777                          License: GPLv3+
Signature   : (none)
Packager    : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
URL         : http://fedorahosted.org/sssd/
Summary     : System Security Services Daemon

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0975.html