reimplement licensing to work with RHSM and entitlement uploads

Co-authored-by: Christian Adams <chadams@redhat.com>

awx/conf/migrations/0008_subscriptions.py

@@ -0,0 +1,20 @@
+# Generated by Django 2.2.11 on 2020-08-04 15:19
+
+import logging
+
+from django.db import migrations
+
+from awx.conf.migrations import _subscriptions as subscriptions
+
+logger = logging.getLogger('awx.conf.migrations')
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('conf', '0007_v380_rename_more_settings'),
+    ]
+
+    operations = [
+        migrations.RunPython(subscriptions.clear_old_license),
+    ]