More jabber settings brought in from json env

* In addition to the JABBER settings, now we want to be sure to get
  DATABASE_ROUTERS, too.

lms/envs/aws.py

@@ -104,6 +104,7 @@ PLATFORM_NAME = ENV_TOKENS.get('PLATFORM_NAME', PLATFORM_NAME)
 SITE_NAME = ENV_TOKENS['SITE_NAME']
 SESSION_COOKIE_DOMAIN = ENV_TOKENS.get('SESSION_COOKIE_DOMAIN')
 JABBER = ENV_TOKENS.get('JABBER', {})
+DATABASE_ROUTERS = ENV_TOKENS.get('DATABASE_ROUTERS', [])
 
 # 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

lms/envs/common.py

@@ -758,6 +758,7 @@ TEMPLATE_VISIBLE_SETTINGS = [
 
 ############################### CHAT ################################
 JABBER = {}
+DATABASE_ROUTERS = []
 
 ############################### THEME ################################
 def enable_theme(theme_name):