Ticket 49830 - Import fails if backend name is "default"
Bug Description: The server was previously reserving the backend
name "default". If you tried to import on a
backend with this name the import would skip all
Fix Description: Change the default backend name to something
obscure, instead of "default".
Also improved lib389's dbgen to generate the
correct "dc" attribute value in the root node.
Reviewed by: spichugi(Thanks!)
(cherry picked from commit 8fa838a4ffd4d0c15ae51cb21f246bb1f2dea2a1)