Integration testing in CI for rollout object creation

[tyler-ball]

Automate the manual testing from #1394 and #1457

Acceptance Criteria

1. Integration tests should be run on every build of the chef-workstation repo because that is where the component currently lives.
2. Integration test should:
   1. Ensure the test cookbook is applied on a set of nodes, and those nodes are configured to run chef-client regularly
   2. Update a cookbook and policyfile so a new SHA is generated
   3. chef install && chef push the updated policyfile
   4. Validate the Rollout object is created
   5. Validate that the Rollout object is updated as nodes start to converge

Questions / Notes

1. We need to ensure that our test environment is setup to support this integration test. This requires a Chef Server, an Automate server, and a set of nodes successfully running chef-client that report into the Chef Server. Should this setup be part of every integration run?

Related Issues

#1522 - Add required infrastructure