Notification serializers, views, and tasks

* Implement concrete Notification model for notification runs
* Implement NotificationTemplate and Notification serializers and views
* Implement ancillary views
* Implement NotificationTemplate trigger m2m fields on all job templates
  via a fields mixin
* Link NotificationTemplates with an org
* Link notifications with the activity stream
* Implement Notification celery tasks
* Extend Backend field parameters to identify sender and receiver as
  parameters needed by the message and not the backend itself
* Updates to backends to better fit the django email backend model as it
  relates to Messages
* Implement success job chain task + notifications
* Implement notifications in error job chain task

awx/main/models/base.py

@@ -25,7 +25,7 @@ from awx.main.utils import encrypt_field
 
 __all__ = ['VarsDictProperty', 'BaseModel', 'CreatedModifiedModel',
            'PasswordFieldsModel', 'PrimordialModel', 'CommonModel',
-           'CommonModelNameNotUnique',
+           'CommonModelNameNotUnique', 'NotificationFieldsModel',
            'PERM_INVENTORY_ADMIN', 'PERM_INVENTORY_READ',
            'PERM_INVENTORY_WRITE', 'PERM_INVENTORY_DEPLOY', 'PERM_INVENTORY_SCAN',
            'PERM_INVENTORY_CHECK', 'PERM_JOBTEMPLATE_CREATE', 'JOB_TYPE_CHOICES',
@@ -337,3 +337,26 @@ class CommonModelNameNotUnique(PrimordialModel):
         max_length=512,
         unique=False,
     )
+
+class NotificationFieldsModel(BaseModel):
+
+    class Meta:
+        abstract = True
+
+    notification_errors = models.ManyToManyField(
+        "NotificationTemplate",
+        blank=True,
+        related_name='%(class)s_notifications_for_errors'
+    )
+
+    notification_success = models.ManyToManyField(
+        "NotificationTemplate",
+        blank=True,
+        related_name='%(class)s_notifications_for_success'
+    )
+
+    notification_any = models.ManyToManyField(
+        "NotificationTemplate",
+        blank=True,
+        related_name='%(class)s_notifications_for_any'
+    )