Bug 5995 Followup: checkpw was returning inconsistent values

Bug 5995 Followup: checkpw was returning inconsistent values

In the case of LDAP, checkpw was returning the cardnumber of there user, but it was being treated as the
userid.  This patch updates checkpw_ldap to return the cardnumber AND the userid, and updates checkpw to
uniformly return cardnumber and userid in all instances, so that whoever is authenticating can use the
desired value in the right way.
(cherry picked from commit dcb4ac77fbfd813cc0eb39e060b49a7b8d491016)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>