Improve gRPC Python tests

[rsmontero]

Description
The current gRPC implementation provides raw access to the API methods and data. This issue is to create helper classes like the one present in PyONE to easily invoke calls and parse return data.

Use case
Easy Python programming

Interface Changes
New gRPC - Python library

Additional Context

Progress Status

• Code committed
• Testing - QA
• Documentation (Release notes - resolved issues, compatibility, known issues)