Increase precision of elapsed time in casandra-cli
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                 Key: CASSANDRA-3460
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3460
             Project: Cassandra
          Issue Type: Improvement
          Components: Tools
    Affects Versions: 1.0.2
            Reporter: Radim Kolar
            Priority: Minor


Cassandra often return response in less then < 1 ms

from another datacenter
[default@test] get sipdb[23];
Returned 0 results.
Elapsed time: 219 msec(s).

from own dataceter
[default@test] get sipdb[13];
Returned 0 results.
Elapsed time: 0 msec(s).

Precession of this timer needs to be increased a bit, while looking at network 
latency adding 1 number should be enough like : 0.2 ms should be sufficient. 

It would be good to display sub milliseconds only if time elapsed is < 1 ms.

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