The openssh-service-type requires 'networking to be setup. So add a
static-networking-service-type that provides it.
* gnu/tests/security.scm
(run-fail2ban-extension-test)[simple-operating-system]: Add
static-networking-service-type service.
Change-Id: I8d736cbf3fcaa54f86fbd60c52b3595b647731e2
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>