output-json-tls: added SNI field to extended output

Added SNI field to extended JSON output.

src/output-json-tls.c

@@ -92,6 +92,12 @@ void JsonTlsLogJSONExtended(json_t *tjs, SSLState * state)
     json_object_set_new(tjs, "fingerprint",
                         json_string(state->server_connp.cert0_fingerprint));
 
+    /* tls.sni */
+    if (state->client_connp.sni) {
+        json_object_set_new(tjs, "sni",
+                            json_string(state->client_connp.sni));
+    }
+
     /* tls.version */
     switch (state->server_connp.version) {
         case TLS_VERSION_UNKNOWN: