r24459: Fix up ldap.js and test_ldb.sh to test the domain_scope control, and

r24459: Fix up ldap.js and test_ldb.sh to test the domain_scope control, and
to test the behaviour of objectCategory=user searches.

It turns out (thanks to a hint on
http://blog.joeware.net/2005/12/08/147/) that objectCategory=user maps
into objectCategory=CN=Person,... (by the defaultObjectCategory of
that objectclass).

Simplify the entryUUID module by using the fact that we now set the DN
as the canoncical form of objectCategory.

Andrew Bartlett