inventory is unique on <name, org>

* was unique on name because we were inheriting from a Model that had it
defined as such. Thus our expression of uniqueness in the Inventory
Model was meaningless.

awx/main/migrations/0052_v310_inventory_name_non_unique.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('main', '0051_v310_job_project_update'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='inventory',
+            name='name',
+            field=models.CharField(max_length=512),
+        ),
+    ]