hub: remove a separate model for a single permission

The `errata_xmlrpc_scan` user permission was moved to the more
appropriate `Scan` model.

osh/hub/scan/migrations/0017_auto_20231102_1414.py

@@ -0,0 +1,20 @@
+# Generated by Django 3.2.20 on 2023-11-02 14:14
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('scan', '0016_recompute_subtask_count'),
+    ]
+
+    operations = [
+        migrations.DeleteModel(
+            name='Permissions',
+        ),
+        migrations.AlterModelOptions(
+            name='scan',
+            options={'get_latest_by': 'date_submitted', 'permissions': [('errata_xmlrpc_scan', 'Can submit ET scan via XML-RPC')]},
+        ),
+    ]

osh/hub/scan/models.py

@@ -105,17 +105,6 @@
 )
 
 
-class Permissions(models.Model):
-    """
-    Custom permissions
-    """
-    class Meta:
-        permissions = (
-            ('errata_xmlrpc_scan',
-             'Can submit ET scan via XML-RPC'),
-        )
-
-
 class MockConfigMixin:
     def verify_by_name(self, name):
         try:
@@ -584,6 +573,9 @@ class Scan(models.Model):
 
     class Meta:
         get_latest_by = "date_submitted"
+        permissions = [
+            ('errata_xmlrpc_scan', 'Can submit ET scan via XML-RPC'),
+        ]
 
     def __str__(self):
         prefix = "#%s %s %s" % (self.id,