misc. improvements, improve running locally#2

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srl295 wants to merge 3 commits intocfsworkload:masterfrom srl295:local

+47-58

Commits on May 16, 2016

general cleanup, improve running locally
srl295
committed

Commits on May 19, 2016

Don’t print error if the DB already exists
srl295
committed

Commits on May 23, 2016

use a local logfile for mqtt
srl295
committed