Use firewall_driver flag as expected with NWFilterFirewall.  This way, either you use NWFilterFirewall directly, or you use IptablesFirewall, which creates its own instance of NWFilterFirewall for the setup_basic_filtering command.  This removes the requirement that LibvirtConnection would always need to know about NWFirewallFilter, and cleans up the area where the flag is used for loading the firewall class.
Use firewall_driver flag as expected with NWFilterFirewall.  This way, either you use NWFilterFirewall directly, or you use IptablesFirewall, which creates its own instance of NWFilterFirewall for the setup_basic_filtering command.  This removes the requirement that LibvirtConnection would always need to know about NWFirewallFilter, and cleans up the area where the flag is used for loading the firewall class.
n0ano/ganttclient