progress on fio --client

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Am now running with Jens patch "ignore SEND_ETA, if we can't fin a reply command ".   Thanks!  I was trying to solve it by increasing timeout.

I did the last commit on PR 241 to address the remaining comment.  If it looks ok to you, I would appreciate this being pulled in because it is important to distributed fio --client testing in order to get bandwidth/iops logs and latency histogram logs.    I have been testing it for about a week now with 900 workload generator threads across 7 hosts and it seems to work, especially now that assertion isn't firing because of above patch.

An unrelated minor problem - There are still a couple of threads that have trouble returning a fio histogram to the test driver, will look into that, but at least fio --client is getting almost all the logs now with PR 241, enough that meaningful stats can be generated.  Error messages are:

fio: failed decompressing log
fio: failed converting IO log

This doesn't happen for smaller numbers of workload generator threads.

-ben e
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