Fix migration hierarchy updating

awx/main/migrations/0026_v300_credential_unique.py

@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 
 from awx.main.migrations import _rbac as rbac
+from awx.main.migrations import _migration_utils as migration_utils
 from django.db import migrations
 import awx.main.fields
 
@@ -21,5 +22,6 @@ class Migration(migrations.Migration):
             name='read_role',
             field=awx.main.fields.ImplicitRoleField(related_name='+', parent_role=[b'singleton:system_auditor', b'use_role', b'owner_role', b'organization.auditor_role'], to='main.Role', null=b'True'),
         ),
+        migrations.RunPython(migration_utils.set_current_apps_for_migrations),
         migrations.RunPython(rbac.rebuild_role_hierarchy),
     ]