The existing version of LDAP_Auth.pm assumed that the user's
bind DN could be derived from the base DN, the ID attribute, and
the user's ID. This is frequently the case, but not always,
particularly in Active Directory setups using sAMAccountName. This
commit instead uses the initial LDAP lookup as the authority for
determining the user's DN.
Signed-off-by: Dan Wells <dbw2@calvin.edu> Signed-off-by: Bill Erickson <berick@esilibrary.com>