s4:tls_tstream: create tstream_tls_params_internal
The following commits will implement the reloading of tls certificates.
Therefore we need to overwrite the interal memory.
Note we need to make sure x509_cred and dh_params from
tstream_tls_params_internal stay alive for the whole lifetime
of this session!
See 'man gnutls_credentials_set' and
'man gnutls_certificate_set_dh_params'.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Jule Anger <janger@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>