修复销毁maat句柄（Maat_burn_feather）时没有释放FieldStat句柄的bug。

src/entry/Maat_api.cpp

@@ -813,8 +813,8 @@ int Maat_initiate_feather(Maat_feather_t feather)
 	
 	maat_stat_init(_feather);
 
-	pthread_t cfg_mon_t;
-	pthread_create(&cfg_mon_t, NULL, thread_rule_monitor, (void*)_feather);
+
+	pthread_create(&(_feather->cfg_mon_t), NULL, thread_rule_monitor, (void*)_feather);
 	return 0;
 
 }
@@ -889,6 +889,8 @@ void Maat_burn_feather(Maat_feather_t feather)
 {
 	struct _Maat_feather_t* _feather=(_Maat_feather_t*)feather;
 	_feather->still_working=0;//destroy will proceed in thread_rule_monitor
+	void* ret=NULL;
+	pthread_join(_feather->cfg_mon_t, &ret);
 	return;
 }
 int Maat_table_register(Maat_feather_t feather,const char* table_name)

src/entry/Maat_rule.cpp

@@ -3576,6 +3576,10 @@ void *thread_rule_monitor(void *arg)
 		feather->redis_write_ctx=NULL;
 		pthread_mutex_unlock(&(feather->redis_write_lock));
 	}
+	if(feather->stat_on&& feather->stat_handle)
+	{
+		FS_stop(&(feather->stat_handle));
+	}
 	free(feather);
 	return NULL;
 }

src/inc_internal/Maat_rule_internal.h

@@ -415,6 +415,7 @@ struct _Maat_feather_t
 	char group_tn[MAX_TABLE_NAME_LEN];
 	pthread_mutex_t backgroud_update_mutex;
 	unsigned char decrypt_key[MAX_TABLE_NAME_LEN];
+	pthread_t cfg_mon_t;
 	
 	char redis_ip[MAX_TABLE_NAME_LEN];
 	int redis_port;