network: avoid trying to create global firewall rules if unprivileged
The unprivileged libvirtd does not have permission to create firewall rules, or bridge devices, or do anything to the host network in general. Historically we still activate the network driver though and let the network start API call fail. The startup code path which reloads firewall rules on active networks would thus effectively be a no-op when unprivileged as it is impossible for there to be any active networks With the change to use a global set of firewall chains, however, we now have code that is run unconditionally. Ideally we would not register the network driver at all when unprivileged, but the entanglement with the virt drivers currently makes that impractical. As a temporary hack, we just make the firewall reload into a no-op. Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com> (cherry picked from commit 5d010c3d)
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