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
(This used to be commit b474be9507df51982a604289215bb1868124fc24)