API to get ciphersuite

[Nikos Mavrogiannopoulos]

On Mon, 2014-11-03 at 14:54 +0000, David Woodhouse wrote:

> We could potentially declare that it's only valid to call
> openconnect_get_cstp_cipher() when CSTP is actually *connected*... but
> CSTP can disconnect due to DPD and reconnect at *any* time, so that
> seems a little inappropriate.

Maybe it makes sense to cache that value once a handshake is complete,
and return the const string from the get_cipher functions. In that case
it would return the value of the last channel that was available.

regards,
Nikos