Test - As a user, I can use the REST API to dispatch a Pulp 2 to 3 migration task.
The Django app in the pulp-2to3-migrate repo needs to provide a view that handles requests at /pulp/api/v3/migrate_pulp2/.
This view should accept 2 parameters: dry_run (boolean) and migration_plan (JSON object). Both of the parameters should be used to dispatch a task called "migrate_from_pulp2". This task should sleep for 1 second and then exit.