According to feedback from @stulzq and @whalesongAndLittleFish ,when Layotto can not connect to the redis server(for example,you wrote a wrong redis port in the Layotto configuration file), the logs are not detailed and we can't find out why error happens.

Steps to reproduce:

1. Start a Layotto with a redis lock component following the quickstart document ,but configurate a wrong redis port
2. Use redis lock demo client to invoke Layotto. The client will panic,and the client logs are as follows:
   
   But the server logs are not detailed,you can't find out why:
   

What would you like to be added:
Add detailed log when grpc API error

Chinese:
目前Layotto配置配错了、连接redis异常时，client调分布式锁API会报错，但是从日志中看不出来为啥报错
需要优化日志，连接redis异常时打印更详细的日志，方便排查。