Add migration for creating the Professional Certificate program type

ECOM-6594

course_discovery/apps/edx_catalog_extensions/migrations/0002_create_professional_certificate_program_type.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.11 on 2016-12-19 19:51
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+PAID_SEAT_TYPES = ('credit', 'professional', 'verified',)
+PROGRAM_TYPE = 'Professional Certificate'
+
+
+def add_program_type(apps, schema_editor):
+    SeatType = apps.get_model('course_metadata', 'SeatType')
+    ProgramType = apps.get_model('course_metadata', 'ProgramType')
+
+    seat_types = SeatType.objects.filter(slug__in=PAID_SEAT_TYPES)
+
+    program_type, __ = ProgramType.objects.update_or_create(name=PROGRAM_TYPE)
+    program_type.applicable_seat_types.clear()
+    program_type.applicable_seat_types.add(*seat_types)
+    program_type.save()
+
+
+def drop_program_type(apps, schema_editor):
+    ProgramType = apps.get_model('course_metadata', 'ProgramType')
+    ProgramType.objects.filter(name=PROGRAM_TYPE).delete()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('edx_catalog_extensions', '0001_squashed_0003_create_publish_to_marketing_site_flag'),
+    ]
+
+    operations = [
+        migrations.RunPython(add_program_type, drop_program_type)
+    ]