Embargo Middleware feature

Adds configurable middleware in common/djangoapps/embargo that
allows specific courses to comply with US Export regulations by
embargoing students from specific countries, whilst simultaneously
allowing other courses to be freely open to all.

cms/envs/common.py

@@ -97,6 +97,9 @@ sys.path.append(PROJECT_ROOT / 'lib')
 sys.path.append(COMMON_ROOT / 'djangoapps')
 sys.path.append(COMMON_ROOT / 'lib')
 
+# For geolocation ip database
+GEOIP_PATH = REPO_ROOT / "common/static/data/geoip/GeoIP.dat"
+
 
 ############################# WEB CONFIGURATION #############################
 # This is where we stick our compiled template files.
@@ -195,6 +198,8 @@ MIDDLEWARE_CLASSES = (
 
     # for expiring inactive sessions
     'session_inactivity_timeout.middleware.SessionInactivityTimeout',
+
+    'embargo.middleware.EmbargoMiddleware',
 )
 
 ############# XBlock Configuration ##########
@@ -465,6 +470,8 @@ INSTALLED_APPS = (
     # User preferences
     'user_api',
     'django_openid_auth',
+
+    'embargo',
 )