fwdriver: fix sudoers file

salt/fwdriver/files/sudoers

 {{ pillar['fwdriver']['user'] }}    ALL= (ALL) NOPASSWD: /sbin/ip netns exec fw ip addr *, /sbin/ip netns exec fw ip ro *, /sbin/ip netns exec fw ip link *, /sbin/ip netns exec fw ipset *, /usr/bin/ovs-vsctl, /sbin/ip netns exec fw iptables-restore -c, /sbin/ip netns exec fw ip6tables-restore -c, /etc/init.d/isc-dhcp-server restart, /sbin/ip link *, /sbin/iptables-restore -c, /sbin/ip6tables-restore -c, /sbin/ipset *
+Defaults: fw !requiretty