remove channel group model

* Websocket user session <-> group subscription membership now resides
in Redis rather than the database.

awx/main/migrations/0110_delete_channelgroup.py

@@ -0,0 +1,16 @@
+# Generated by Django 2.2.8 on 2020-02-17 14:50
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('main', '0109_v370_instance_ip_address'),
+    ]
+
+    operations = [
+        migrations.DeleteModel(
+            name='ChannelGroup',
+        ),
+    ]

awx/main/models/__init__.py

@@ -58,7 +58,6 @@ from awx.main.models.workflow import (  # noqa
     WorkflowJob, WorkflowJobNode, WorkflowJobOptions, WorkflowJobTemplate,
     WorkflowJobTemplateNode, WorkflowApproval, WorkflowApprovalTemplate,
 )
-from awx.main.models.channels import ChannelGroup # noqa
 from awx.api.versioning import reverse
 from awx.main.models.oauth import ( # noqa
     OAuth2AccessToken, OAuth2Application

awx/main/models/channels.py

@@ -1,6 +0,0 @@
-from django.db import models
-
-
-class ChannelGroup(models.Model):
-    group = models.CharField(max_length=200, unique=True)
-    channels = models.TextField()