Remove Django patterns from code.
Patterns from django.conf.urls has been removed in Django 1.10.
Current Django version in devstack is 1.10.7
Remove global_settings.TEMPLATE_CONTEXT_PROCESSORS because this
variable has been removed in Django 1.10.
Story: 2001120
Task: 4811
Change-Id: I84a4aceb73abd37dab4acf43b9abf8b43c7f1625