iodine service: add clients implimentation

- services.iodined moved to services.iodine
- configuration file backwards compatable
- old iodine server configuration moved to services.iodine.server
- attribute set services.iodine.clients added to specify any number
  of iodine clients
  - example:
    iodine.clients.home = { server = "iodinesubdomain.yourserver.com"; ... };
  - client services names iodine-name where name would be home