Merge ~adam-collard/maas:event-node-migration-donothing into maas:master

[Adam Collard]

Add migration for event.node to on_delete DO_NOTHING

Fixes LP:1862379

[Alberto Donato (ack)]

+1

review: Approve

[MAAS Lander (maas-lander)]

LANDING
-b event-node-migration-donothing lp:~adam-collard/maas/+git/maas into -b master lp:~maas-committers/maas

STATUS: FAILED BUILD
LOG: http://maas-ci-jenkins.internal:8080/job/maas/job/branch-tester/7116/consoleText

[MAAS Lander (maas-lander)]

UNIT TESTS
-b event-node-migration-donothing lp:~adam-collard/maas/+git/maas into -b master lp:~maas-committers/maas

STATUS: FAILED
LOG: http://maas-ci-jenkins.internal:8080/job/maas/job/branch-tester/7117/console
COMMIT: 46bae719156868a6b8a3032a1258d1193d95f265

review: Needs Fixing

6b94f20... by Adam Collard on 2020-02-07

Blacken

diff --git a/src/maasserver/migrations/maasserver/0202_event_node_on_delete.py b/src/maasserver/migrations/maasserver/0202_event_node_on_delete.py
new file mode 100644
index 0000000..3ccef4e
--- /dev/null
+++ b/src/maasserver/migrations/maasserver/0202_event_node_on_delete.py
@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.11 on 2020-02-07 15:48
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [("maasserver", "0201_merge_20191008_1426")]
+
+    operations = [
+        migrations.AlterField(
+            model_name="event",
+            name="node",
+            field=models.ForeignKey(
+                editable=False,
+                null=True,
+                on_delete=django.db.models.deletion.DO_NOTHING,
+                to="maasserver.Node",
+            ),
+        )
+    ]