Tests: disabled session tickets.

This is a workaround for session reuse issues seen with older openssl.

ssl.t

diff --git a/ssl.t b/ssl.t
index 7a3cc48..84ed1d6 100644
--- a/ssl.t
+++ b/ssl.t
@@ -53,6 +53,7 @@
         ssl_certificate_key localhost.key;
         ssl_certificate localhost.crt;
         ssl_session_cache shared:SSL:10m;
+        ssl_session_tickets off;
 
         location /reuse {
             return 200 "body $ssl_session_reused";