bugfix:修复了flumeagent节点删除没有从本地移除的bug导致坏死节点会被使用
修复关掉sink_server时错误将redispool关掉导致无法消费

	new file:   ../consumer/flume_node_watcher.go
	modified:   ../consumer/log_sink.go
	modified:   ../consumer/log_sink_manager.go
	modified:   ../consumer/pool.go
	modified:   ../consumer/pool_test.go