Improve dnsmasq interface handling

listen-address is enough; adding interface too causes weird issues where
dnsmasq is listening on an IPv6 global wildcard too which conflicts with
the PowerDNS instance.

node-daemon/pvcd/VXNetworkInstance.py

@@ -609,8 +609,6 @@ add rule inet filter forward ip6 saddr {netaddr6} counter jump {vxlannic}-out
                 '--dhcp-script={}/pvcd/dnsmasq-zookeeper-leases.py'.format(os.getcwd()),
                 '--dhcp-hostsdir={}'.format(self.dnsmasq_hostsdir),
                 '--bind-interfaces',
-                '--interface={}'.format(self.bridge_nic),
-                '--except-interface=lo',
             ]
             dhcp_configuration_v4 = [
                 '--listen-address={}'.format(self.ip4_gateway),