Description of problem:

With the coming migration away from engine-manage-domains where the admin specifies the Kerberos server(s) or Windows Active Directory domain controllers to ovirt-engine-extensions-aaa-ldap where the admin uses DNS SRV records to find domain controller(s), RHEV needs a way to report which domain controllers it's using at any given time.

This is important for management and troubleshooting when login problems occur.  Is there a problem with a domain controller?  In order to answer this question, it's important to know **which** domain controller is in use.

This needs to be available to both the RHEVM GUI and Java and other APIs.