Added DevInfo implementation (IDL 6)

Jose A. Ramosrequested to merge
579-add-dev-info into develop

Added DevInfo implementation. Binding from cppTango methods, map from get_version_info to a dict stored at device_info.version_info.

Override LatestDeviceImpl __init__ to add python version info.

Closes #579 (closed)

Edited by Anton Joubert

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