Make TLS options of Master/Admin/Developer Portal routes configurable

Currently, in order to allow access to the (Admin, Master, Developer) portals via http it is necessary to configure routes that are generated by Zync manually.

Multiple customers need to configure these (e.g. because they do SSL offloading). Since these routes are managed by zync, manual configuration isn't desirable. So the request is to make these configurable via environment variables.

Expected options are:

• TLS enabled
  • edge/Redirect
  • edge/Allow
• TLS disabled