Update privacy and TOS links for edge.

Currently,edge environment is serving empty pages against privacy
and TOS.Now, this behaviour is modified by pointing those links to
edX's privacy and TOS pages.

PROD-1066

common/djangoapps/edxmako/shortcuts.py

@@ -15,16 +15,17 @@
 from __future__ import absolute_import
 
 import logging
-import six
-from six.moves.urllib.parse import urljoin
 
+import six
 from django.conf import settings
-from django.urls import reverse
 from django.http import HttpResponse
 from django.template import engines
+from django.urls import reverse
+from six.moves.urllib.parse import urljoin
 
 from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
 from openedx.core.djangoapps.theming.helpers import is_request_in_themed_site
+from xmodule.util.xmodule_django import get_current_request_hostname
 
 from . import Engines
 
@@ -70,9 +71,13 @@ def marketing_link(name):
     elif not enable_mktg_site and name in link_map:
         # don't try to reverse disabled marketing links
         if link_map[name] is not None:
-            return reverse(link_map[name])
+            host_name = get_current_request_hostname()
+            if all([host_name and 'edge' in host_name, 'http' in link_map[name]]):
+                return link_map[name]
+            else:
+                return reverse(link_map[name])
     else:
-        log.debug("Cannot find corresponding link for name: %s", name)
+        log.debug(u"Cannot find corresponding link for name: %s", name)
         return '#'