Remove RADIUS authentication (#15548)

Remove RADIUS authentication from AWX

Do not remove models fields and tables let it for a stage where all the work of removing external auth finished AAP-27707

Co-authored-by: Hao Liu <44379968+TheRealHaoLiu@users.noreply.github.com>

awx/conf/migrations/0011_remove_radius_auth_conf.py

@@ -0,0 +1,23 @@
+from django.db import migrations
+
+RADIUS_AUTH_CONF_KEYS = [
+    'RADIUS_SERVER',
+    'RADIUS_PORT',
+    'RADIUS_SECRET',
+]
+
+
+def remove_radius_auth_conf(apps, scheme_editor):
+    setting = apps.get_model('conf', 'Setting')
+    setting.objects.filter(key__in=RADIUS_AUTH_CONF_KEYS).delete()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('conf', '0010_change_to_JSONField'),
+    ]
+
+    operations = [
+        migrations.RunPython(remove_radius_auth_conf),
+    ]