Cvprac

- Add support for Python 3.
- Add necessary methods and update systests to put CVP node under test back to original state.
- Update add_image method to use cvp_client.
- Reformat client _make_request method to support Python 3 format.

- Added method for getting device running config.
- Added methods for working with change controls.
- Fix connection handling for CVP 2018 support.
- Enhance api modules to handle API changes in CVP 2018.2.
- Added flag for waitForTaskIds parameter to update_configlets method.
- Added assorted methods for APIs related to configlets, images, and topology.

- Add Inventory handling methods.
- Add basic logout method.
- Add query parameter to get_inventory.
- Add contact info to docs.
- Several Bug Fixes.

- Add validate_config api function
- Update client protocol to default to https with http fallback.
- Store last node a request was sent to in CvpClient object.
- Fix bug when removing images from devices and containers.
- Update to use default Python logging module.

- Adds image upgrade
- Adds wrapper for deploying a device
- Adds ability to set logging level
- Prepends call to addTempAction before saveTopology

- Added support for API calls (5)
- Pypi package fixes (11)
- Added request timeout instance variable to API so user may specify client get/post timeouts used by API calls. (12)

[Full Changelog](https://github.com/aristanetworks/cvprac/compare/v0.5.0...v0.6.0)