Create harvest runner main function for dcatus

[rshewitt]

User Story

In order for the harvest runner to process a harvest source, datagov wants to create a main function in harvest.py responsible for processing a harvest source.

Acceptance Criteria

[ACs should be clearly demoable/verifiable whenever possible. Try specifying them using BDD.]

• [ ] GIVEN harvest.py
  WHEN main is called
  THEN a dcatus source should be harvested

Background

[Any helpful contextual notes or links to artifacts/evidence, if needed]

Security Considerations (required)

[Any security concerns that might be implicated in the change. "None" is OK, just be explicit here!]

Sketch

• main function steps
  • parse sys.argv and get the jobid
  • pull the associated harvest source information from the DB via the jobid
  • create a HarvestSource instance using the derived harvest source information
  • get records changes
  • synchronize records
• get a simple harvest source as a test
• this'll be an integration test [Notes or a checklist reflecting our understanding of the selected approach]