runzhiwang opened a new pull request #167:
URL: https://github.com/apache/incubator-ratis/pull/167


   ## What changes were proposed in this pull request?
   
   clear `servers` when shutdown MiniRaftCluster.
   Otherwise, if we need to run test several times to debug, the second time 
will fail at `Preconditions.assertTrue(servers.put(id, s) == null);`.
   
   
![image](https://user-images.githubusercontent.com/51938049/89363585-2989ec80-d703-11ea-86d4-23b152eb87e9.png)
   
   
![image](https://user-images.githubusercontent.com/51938049/89363540-095a2d80-d703-11ea-8718-f461e949f30c.png)
   
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/RATIS-1022
   
   ## How was this patch tested?
   
   No need to add test.
   


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