dsdb: When using an LDAP backend, force use of the password from secrets.ldb

dsdb: When using an LDAP backend, force use of the password from secrets.ldb

This makes testing from the command line much easier, as ldbsearch -H
sam.ldb will now just work as well as it did with a tdb-based
provision.

This code was removed from it's previous location outside the ldb
module stack in aabda85a2fc9f6763abd56d61ff819012f2225ad.

Andrew Bartlett

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Nadezhda Ivanova <nivanova@symas.com>
Autobuild-User(master): Nadezhda Ivanova <nivanova@samba.org>
Autobuild-Date(master): Wed Sep 11 21:15:50 CEST 2013 on sn-devel-104