chore(django): remove the use of site framework

Only one django site is used so we do not need the site framework (https://docs.djangoproject.com/en/1.9/ref/contrib/sites/)

Author: helgi

rootfs/deis/settings.py

@@ -35,8 +35,6 @@
 # http://www.i18nguy.com/unicode/language-identifiers.html
 LANGUAGE_CODE = 'en-us'
 
-SITE_ID = 1
-
 # If you set this to False, Django will make some optimizations so as not
 # to load the internationalization machinery.
 USE_I18N = True
@@ -90,7 +88,6 @@
     'django.middleware.common.CommonMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
-    'django.contrib.sites.middleware.CurrentSiteMiddleware',
     'api.middleware.APIVersionMiddleware',
     'deis.middleware.PlatformVersionMiddleware',
     # Uncomment the next line for simple clickjacking protection:
@@ -108,7 +105,6 @@
     'django.contrib.humanize',
     'django.contrib.messages',
     'django.contrib.sessions',
-    'django.contrib.sites',
     # Third-party apps
     'corsheaders',
     'guardian',