test: Start libvirtd on packagekit tests for Debian
test: Start libvirtd on packagekit tests for Debian

Same as in commit 458e145 for the Ubuntu part. Without the virbr0
interface, NM thinks it's offline.

Closes #13652
deryni/cockpit,mvollmer/cockpit,mvollmer/cockpit,mvollmer/cockpit,garrett/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,cockpit-project/cockpit,deryni/cockpit,martinpitt/cockpit,cockpituous/cockpit,garrett/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,mvollmer/cockpit,deryni/cockpit,cockpituous/cockpit,cockpit-project/cockpit,cockpituous/cockpit,deryni/cockpit,cockpituous/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpituous/cockpit,deryni/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,martinpitt/cockpit,deryni/cockpit,garrett/cockpit,garrett/cockpit,garrett/cockpit,cockpit-project/cockpit,deryni/cockpit