Add IPv6 support to ADS client side LDAP connects. Corrected format for IPv6 LDAP URI. Signed-off-by: David Holder <david.holder@erion.co.uk>

Signed-off-by: David Holder <david.holder@erion.co.uk>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <rb@sernet.de>
