Release 2.18.0

- [API] Rename "0-RTT" to "session resumption." In IETF QUIC, "0-RTT"
  always refers to early data, meaning a request that the server can
  reply to in the very first return flight.  A more appropriate name
  for what we support on the client site is "session resumption," which
  is standard TLS terminology.  Later, when we add support for 0-RTT
  (early data), we can use the 0-RTT terminology again, this time in
  proper context.
- [BUGFIX] Do not set certificate callback if ea_lookup_cert is NULL.
- [BUGFIX] Make connection tickable when it's marked as closed.
- [BUGFIX] Fail certificate lookup if SNI is not present in HTTP mode.
- Several documentation fixes and improvements.
- Minor code cleanup.

bin/prog.c

@@ -376,7 +376,7 @@ prog_eb (struct prog *prog)
 
 
 int
-prog_connect (struct prog *prog, unsigned char *zero_rtt, size_t zero_rtt_len)
+prog_connect (struct prog *prog, unsigned char *sess_resume, size_t sess_resume_len)
 {
     struct service_port *sport;
 
@@ -388,7 +388,7 @@ prog_connect (struct prog *prog, unsigned char *zero_rtt, size_t zero_rtt_len)
                     /* SNI is required for HTTP */
                   : prog->prog_engine_flags & LSENG_HTTP ? sport->host
                   : NULL,
-                    prog->prog_max_packet_size, zero_rtt, zero_rtt_len,
+                    prog->prog_max_packet_size, sess_resume, sess_resume_len,
                     sport->sp_token_buf, sport->sp_token_sz))
         return -1;