fixed a few problems of DataMan/ZeroMQ, and added a simple Transport:…

Podhorszki, Norbertrequested to merge
github/fork/JasonRuonanWang/dataman_rebase into master

Created by: JasonRuonanWang

fixed a few problems of DataMan/ZeroMQ, and added a simple Transport::Read() API to make the hello world workflow working again

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