Lint and base.py -> mixins.py file rename

Author: humitos

readthedocs/storage/azure_storage.py

@@ -1,11 +1,16 @@
+# pylint: disable=abstract-method
+# Disable: Method 'path' is abstract in class 'Storage' but is not overridden
+
+"""Django storage classes to use with Azure Blob storage service."""
+
 from azure.common import AzureMissingResourceHttpError
 from django.conf import settings
 from django.contrib.staticfiles.storage import ManifestFilesMixin
 from storages.backends.azure_storage import AzureStorage
 
 from readthedocs.builds.storage import BuildMediaStorageMixin
 
-from .base import OverrideHostnameMixin
+from .mixins import OverrideHostnameMixin
 
 
 class AzureBuildMediaStorage(BuildMediaStorageMixin, OverrideHostnameMixin, AzureStorage):

readthedocs/storage/base.py renamed to readthedocs/storage/mixins.py

@@ -1,5 +1,8 @@
+"""Django storage mixin classes for different storage backends (Azure, S3)."""
+
 from urllib.parse import urlsplit, urlunsplit
 
+
 class OverrideHostnameMixin:
 
     """