libcli/auth: use the correct creds value against servers without LogonSamLogonEx

libcli/auth: use the correct creds value against servers without LogonSamLogonEx

If we use the credential chain we need to use the value from
netlogon_creds_client_authenticator() to make sure we have the current
value to encrypt in logon info.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12586

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
(cherry picked from commit 0ed2a65593b5abc9ba7f40992ed0ed8f448f5836)