* gnu/installer/newt/services.scm (run-networking-cbt-page): New procedure.
(run-services-page): Call it.
* gnu/installer/services.scm (%system-services): Add OpenSSH and Tor.
(networking-system-service?): New procedure.
* gnu/installer/steps.scm (format-configuration): Add 'networking' and
'ssh' to the service modules.