ENT-1013 Discovery model classes don't have ordering set

This results in a bunch of noise in the error logs, as well as weird
behavior when paginating through results for things like courses.

course_discovery/apps/course_metadata/migrations/0084_auto_20180522_1339.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.11 on 2018-05-22 13:39
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('course_metadata', '0083_auto_20180511_1406'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='course',
+            options={'ordering': ['id']},
+        ),
+        migrations.AlterModelOptions(
+            name='courseentitlement',
+            options={'ordering': ['created']},
+        ),
+        migrations.AlterModelOptions(
+            name='courserunsocialnetwork',
+            options={'ordering': ['created'], 'verbose_name_plural': 'CourseRun SocialNetwork'},
+        ),
+        migrations.AlterModelOptions(
+            name='faq',
+            options={'ordering': ['created'], 'verbose_name': 'FAQ', 'verbose_name_plural': 'FAQs'},
+        ),
+        migrations.AlterModelOptions(
+            name='organization',
+            options={'ordering': ['created']},
+        ),
+        migrations.AlterModelOptions(
+            name='person',
+            options={'ordering': ['created'], 'verbose_name_plural': 'People'},
+        ),
+        migrations.AlterModelOptions(
+            name='personsocialnetwork',
+            options={'ordering': ['created'], 'verbose_name_plural': 'Person SocialNetwork'},
+        ),
+        migrations.AlterModelOptions(
+            name='seat',
+            options={'ordering': ['created']},
+        ),
+        migrations.AlterModelOptions(
+            name='subject',
+            options={'ordering': ['created']},
+        ),
+        migrations.AlterModelOptions(
+            name='topic',
+            options={'ordering': ['created']},
+        ),
+    ]

course_discovery/apps/course_metadata/models.py

@@ -131,6 +131,7 @@ class Subject(TranslatableModel, TimeStampedModel):
             ('partner', 'slug'),
             ('partner', 'uuid'),
         )
+        ordering = ['created']
 
     def validate_unique(self, *args, **kwargs):  # pylint: disable=arguments-differ
         super(Subject, self).validate_unique(*args, **kwargs)
@@ -168,6 +169,7 @@ class Topic(TranslatableModel, TimeStampedModel):
             ('partner', 'slug'),
             ('partner', 'uuid'),
         )
+        ordering = ['created']
 
     def validate_unique(self, *args, **kwargs):  # pylint: disable=arguments-differ
         super(Topic, self).validate_unique(*args, **kwargs)
@@ -242,6 +244,7 @@ class Organization(TimeStampedModel):
             ('partner', 'key'),
             ('partner', 'uuid'),
         )
+        ordering = ['created']
 
     def __str__(self):
         return '{key}: {name}'.format(key=self.key, name=self.name)
@@ -280,6 +283,7 @@ class Person(TimeStampedModel):
             ('partner', 'uuid'),
         )
         verbose_name_plural = _('People')
+        ordering = ['created']
 
     def __str__(self):
         return self.full_name
@@ -378,6 +382,7 @@ class Course(TimeStampedModel):
             ('partner', 'uuid'),
             ('partner', 'key'),
         )
+        ordering = ['id']
 
     def __str__(self):
         return '{key}: {title}'.format(key=self.key, title=self.title)
@@ -841,6 +846,7 @@ class Seat(TimeStampedModel):
         unique_together = (
             ('course_run', 'type', 'currency', 'credit_provider')
         )
+        ordering = ['created']
 
 
 class CourseEntitlement(TimeStampedModel):
@@ -863,6 +869,7 @@ class CourseEntitlement(TimeStampedModel):
         unique_together = (
             ('course', 'mode')
         )
+        ordering = ['created']
 
 
 class Endorsement(TimeStampedModel):
@@ -890,6 +897,7 @@ class FAQ(TimeStampedModel):
     class Meta:
         verbose_name = _('FAQ')
         verbose_name_plural = _('FAQs')
+        ordering = ['created']
 
     def __str__(self):
         return self.question
@@ -1276,6 +1284,7 @@ class PersonSocialNetwork(AbstractSocialNetworkModel):
         unique_together = (
             ('person', 'type'),
         )
+        ordering = ['created']
 
 
 class CourseRunSocialNetwork(AbstractSocialNetworkModel):
@@ -1288,6 +1297,7 @@ class CourseRunSocialNetwork(AbstractSocialNetworkModel):
         unique_together = (
             ('course_run', 'type'),
         )
+        ordering = ['created']
 
 
 class PersonWork(AbstractValueModel):