Introducing websocket support in router and libunit.

src/nxt_router.h

@@ -138,6 +138,13 @@ struct nxt_app_s {
 };
 
 
+typedef struct {
+    size_t                 max_frame_size;
+    nxt_msec_t             read_timeout;
+    nxt_msec_t             keepalive_interval;
+} nxt_websocket_conf_t;
+
+
 typedef struct {
     uint32_t               count;
     nxt_queue_link_t       link;
@@ -164,6 +171,8 @@ typedef struct {
     nxt_msec_t             body_read_timeout;
     nxt_msec_t             send_timeout;
 
+    nxt_websocket_conf_t   websocket_conf;
+
 #if (NXT_TLS)
     nxt_tls_conf_t         *tls;
 #endif