[JIRA] Created: (IDP-114) Create an authentication workflow action that validates a username/password against a Kerberos KDC

[Chad La Joie (JIRA)]

Create an authentication workflow action that validates a username/password against a Kerberos KDC
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                 Key: IDP-114
                 URL: https://issues.shibboleth.net/jira/browse/IDP-114
             Project: Identity Provider
          Issue Type: Task
          Components: Authentication
            Reporter: Chad La Joie
            Assignee: Chad La Joie
            Priority: Blocker
             Fix For: 3.0.0


Create an action that validates the username/password, given via the UsernamePasswordSubcontext on the authn request context, against an LDAP directory.  If the credentials properly validate then set a UsernamePrincipal as the authenticated principal of the authn request context.

Additional notes:
 * support enumerating multiple LDAP directories and failing over connections if some are down
 * connections used to search for the user DN should have the option of being pooled
 * ability to catch locked/disabled accounts and expired passwords

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