Allow session backend to be configurable and also add PLATFORM_NAME

to cms settings (it was throwing 500s for Stanford when the CMS
calls render_from_lms)

cms/envs/aws.py

@@ -92,6 +92,7 @@ LOG_DIR = ENV_TOKENS['LOG_DIR']
 CACHES = ENV_TOKENS['CACHES']
 
 SESSION_COOKIE_DOMAIN = ENV_TOKENS.get('SESSION_COOKIE_DOMAIN')
+SESSION_ENGINE = ENV_TOKENS.get('SESSION_ENGINE', SESSION_ENGINE)
 
 # allow for environments to specify what cookie name our login subsystem should use
 # this is to fix a bug regarding simultaneous logins between edx.org and edge.edx.org which can
@@ -122,6 +123,10 @@ LOGGING = get_logger_config(LOG_DIR,
                             debug=False,
                             service_variant=SERVICE_VARIANT)
 
+#theming start:
+PLATFORM_NAME = ENV_TOKENS.get('PLATFORM_NAME', 'edX')
+
+
 ################ SECURE AUTH ITEMS ###############################
 # Secret things: passwords, access keys, etc.
 with open(ENV_ROOT / CONFIG_PREFIX + "auth.json") as auth_file:

lms/envs/aws.py

@@ -102,8 +102,8 @@ with open(ENV_ROOT / CONFIG_PREFIX + "env.json") as env_file:
 PLATFORM_NAME = ENV_TOKENS.get('PLATFORM_NAME', PLATFORM_NAME)
 EMAIL_BACKEND = ENV_TOKENS.get('EMAIL_BACKEND', EMAIL_BACKEND)
 EMAIL_FILE_PATH = ENV_TOKENS.get('EMAIL_FILE_PATH', None)
-
 SITE_NAME = ENV_TOKENS['SITE_NAME']
+SESSION_ENGINE = ENV_TOKENS.get('SESSION_ENGINE', SESSION_ENGINE)
 SESSION_COOKIE_DOMAIN = ENV_TOKENS.get('SESSION_COOKIE_DOMAIN')
 
 # allow for environments to specify what cookie name our login subsystem should use