This implements Milestone 3 of the VM project.

This controller is used by the VM to store the result of the training job. It needs to do the following things in sequence:

1. Validate the incoming request by calling “validate_request(request_data)” method. If request is valid the proceed ahead otherwise return error code 401 (Unauthorized access).
2. Extract job_request_id, classifier_data from incoming request.
3. Find “ClassifierTrainingJobModel” corresponding to job_request_id. Extract state_name, exp_id, algorithm_id, exp_version from this model.
4. Find classifier_model_id stored in corresponding state. If it is not available then Create new “Classifier Data Model” instance with id = job_request_id.
5. Set exp_id, exp_version, state_name, algorithm_id and classifier_data in model instance. Store model instance in database.
6. Set the classifier_model_id of state to ID of this Classifier Data Model instance.
7. Modify job request model’s status to indicate that job has been finished. Store it back to database.

/cc @anmolshkl @prasanna08