billing: Remove deprecated billing tables and fields from corporate/models.

corporate/migrations/0007_remove_deprecated_fields.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.18 on 2019-01-31 22:16
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('corporate', '0006_nullable_stripe_customer_id'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='billingprocessor',
+            name='log_row',
+        ),
+        migrations.RemoveField(
+            model_name='billingprocessor',
+            name='realm',
+        ),
+        migrations.DeleteModel(
+            name='Coupon',
+        ),
+        migrations.DeleteModel(
+            name='Plan',
+        ),
+        migrations.RemoveField(
+            model_name='customer',
+            name='has_billing_relationship',
+        ),
+        migrations.RemoveField(
+            model_name='customerplan',
+            name='licenses',
+        ),
+        migrations.DeleteModel(
+            name='BillingProcessor',
+        ),
+    ]