port Active Directory datasources from old zenpack

Change from one template name "Active Directory" overridden in three device-classes

   Server/Windows/ActiveDirectory/
                                 .../Active Directory 2008/
                                 .../Active Directory 2008 R2/

to three template names "Active Directory", "Active Directory 2008", and "Active Directory 2008 R2", all defined at Server/Microsoft/Windows. with Active Directory being bound by default.