Fixed bytes/str issues in some migrations (models.Index() arguments).

- Legacy-Id: 16410

ietf/doc/migrations/0003_auto_20180401_1231.py

@@ -15,6 +15,6 @@ class Migration(migrations.Migration):
     operations = [
         migrations.AddIndex(
             model_name='docevent',
-            index=models.Index(fields=[b'type', b'doc'], name='doc_doceven_type_43e53e_idx'),
+            index=models.Index(fields=['type', 'doc'], name='doc_doceven_type_43e53e_idx'),
         ),
     ]

ietf/doc/migrations/0018_remove_old_document_field.py

@@ -57,7 +57,7 @@ class Migration(migrations.Migration):
         ),
         migrations.AddIndex(
             model_name='docevent',
-            index=models.Index(fields=[b'type', b'doc2'], name='doc_doceven_type_ac7748_idx'),
+            index=models.Index(fields=['type', 'doc2'], name='doc_doceven_type_ac7748_idx'),
         ),
         # The following 9 migrations are related to the m2m fields on Document
         # Remove the intermediary model field pointing to Document.name

ietf/doc/migrations/0019_rename_field_document2.py

@@ -63,7 +63,7 @@ class Migration(migrations.Migration):
         ),
         migrations.AddIndex(
             model_name='docevent',
-            index=models.Index(fields=[b'type', b'doc'], name='doc_doceven_type_43e53e_idx'),
+            index=models.Index(fields=['type', 'doc'], name='doc_doceven_type_43e53e_idx'),
         ),
         # Add back the m2m field we removed in 0018_...
         migrations.AddField(