修正suspend/resume语义实现的若干问题，增加自行构建request/response的header标志

plugin/protocol/http/include/internal/http_common.h

@@ -41,18 +41,20 @@ struct http_session_private
 	struct http_half_private * hf_private_req_user;
 	/* USER SETUP RESPONSE HALF */
 	struct http_half_private * hf_private_resp_user;
-	/* SUSPEND TAG */
-	bool suspend_tag_user;
 	/* SUSPEND EVENT */
 	tfe_http_event suspend_event;
 	/* SUSPEND TAG EFFECTIVE */
 	bool suspend_tag_effective;
-	/* STREAM WRITE EFFECTIVE */
-	bool stream_write_tag_effective;
 	/* RELEASE LOCK, when the tag is zero, the session can be destroyed */
 	int release_lock;
 	/* thread id */
 	unsigned int thread_id;
+
+	/* SUSPEND COUNTER, ONLY FOR DEBUG AND LOG */
+#ifndef NDEBUG
+	int suspend_counter;
+#endif
+	bool in_gc_queue;
 };
 
 struct http_connection_private