[CASSANDRA-19651][Review] idealCLWriteLatency metric reports the worst response time instead of the time when ideal CL is satisfied

[Dmitry Konstantinov]

Hello All,

I recently submitted a patch what addresses a bug in idealCLWriteLatency
metric calculation: https://issues.apache.org/jira/browse/CASSANDRA-19651

Could someone help with reviewing it?

Thank you for your time!
-- 
Dmitry