[gnutls-devel] GnuTLS | gnutls-cli: Add option to wait longer for resumption data (!1232)

[Development of GNU's TLS library]

Anderson Sasaki commented on a discussion on src/cli.c: https://gitlab.com/gnutls/gnutls/-/merge_requests/1232#note_334505861

>  	gnutls_datum_t edata = {NULL, 0};
>  
>  	if (gnutls_session_is_resumed(hd->session) == 0) {
> -		/* not resumed - obtain the session data */
> -		ret = gnutls_session_get_data2(hd->session, &rdata);
> -		if (ret < 0) {
> -			rdata.data = NULL;
> -		}
> +		do {
> +			/* not resumed - obtain the session data */
> +			ret = gnutls_session_get_data2(hd->session, &rdata);

I changed my mind, making it specific for TLS 1.3, in which we can actually wait for tickets sent asynchronous after the handshake is finished, makes more sense.

I changed the code to only take effect for TLS 1.3.

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