SSL: preserve default server context in connection (ticket #235). This context is needed for shared sessions cache to work in configurations with multiple virtual servers sharing the same port. Unfortunately, OpenSSL does not provide an API to access the session context, thus storing it separately. In collaboration with Vladimir Homutov.

--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -46,6 +46,7 @@ typedef struct {
 
 typedef struct {
     ngx_ssl_conn_t             *connection;
+    SSL_CTX                    *session_ctx;
 
     ngx_int_t                   last;
     ngx_buf_t                  *buf;