Uneeded sleep time for tests in hbase.master.ServerManager#waitForRegionServers
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                 Key: HBASE-4603
                 URL: https://issues.apache.org/jira/browse/HBASE-4603
             Project: HBase
          Issue Type: Improvement
          Components: test
    Affects Versions: 0.92.0
         Environment: all.
            Reporter: nkeywal
            Assignee: nkeywal
            Priority: Minor


This functions waits for at least 2 times 
hbase.master.wait.on.regionservers.interval, defaulted at 3 seconds, i.e. 6 
seconds for every mini hbase cluster starts.

In the context of a mini cluster, it's not useful, as the regions servers are 
created locally.

Changing this to a lower value such as 100ms gives 5.8 second per HBase cluser 
start. It should lower the build time on the apache server by more than 8%.

Beeing more aggressive (removing all the wait time) could be possible as well. 
To be studied later.

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