Broker

What's Changed
* Added a locking mechanism to actions that modify files by JacobCallahan in https://github.com/SatelliteQE/broker/pull/144


**Full Changelog**: https://github.com/SatelliteQE/broker/compare/0.1.30...0.1.31

What's Changed
* Greatly speed up Session's sftp_write by JacobCallahan in https://github.com/SatelliteQE/broker/pull/143


**Full Changelog**: https://github.com/SatelliteQE/broker/compare/0.1.29...0.1.30

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+ Actually include a line that was supposed to be in 0.1.28

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+ Suppress warnings on inventory load
+ Move file arg evaluation to VMBroker's init

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+ Made CLI checkouts properly raise exceptions

- Added retries to socket.connect
- Also added some better error handling when decoding stdout data