Security update for python-Django (moderate)

This update for python-Django to version 2.08 fixes the following issues:

The following security vulnerability was fixed:

• CVE-2018-14574: Fixed an redirection vulnerability in CommonMiddleware
  (boo#1102680)

The following other bugs were fixed:

• Fixed a regression in Django 2.0.7 that broke the regex lookup on MariaDB
• Fixed a regression where django.template.Template crashed if the
  template_string argument is lazy
• Fixed __regex and __iregex lookups with MySQL
• Fixed admin check crash when using a query expression in
  ModelAdmin.ordering
• Fixed admin changelist crash when using a query expression without asc()
  or desc() in the page’s ordering
• Fixed a regression that broke custom template filters that use decorators
• Fixed detection of custom URL converters in included pattern
• Fixed a regression that added an unnecessary subquery to the GROUP BY
  clause
  on MySQL when using a RawSQL annotation
• Fixed WKBWriter.write() and write_hex() for empty polygons on GEOS 3.6.1+
• Fixed a regression in Django 1.10 that could result in large memory
  usage when making edits using ModelAdmin.list_editable
• Corrected the import paths that inspectdb generates for
  django.contrib.postgres fields
• Fixed crashes in django.contrib.admindocs when a view is a callable
  object, such as django.contrib.syndication.views.Feed
• Fixed a regression in Django 1.11.12 where QuerySet.values() or
  values_list() after combining an annotated and unannotated queryset with
  union(), difference(), or intersection() crashed due to mismatching
  columns