test: Fix NetworkHelpers.add_veth() for multiple devices
test: Fix NetworkHelpers.add_veth() for multiple devices

Don't listen on lo, and use an interface specific log file.

Also fix the typo in the firewall-cmd redirection to avoid a confusing
error message.

cockpit-project/cockpit,garrett/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,deryni/cockpit,deryni/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,deryni/cockpit,mvollmer/cockpit,cockpit-project/cockpit,garrett/cockpit,mvollmer/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,cockpituous/cockpit,deryni/cockpit,mvollmer/cockpit,cockpituous/cockpit,garrett/cockpit,garrett/cockpit,deryni/cockpit,martinpitt/cockpit,martinpitt/cockpit,deryni/cockpit,mvollmer/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,deryni/cockpit,martinpitt/cockpit,garrett/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit