have juju-setup use the new bridge, fix errors
diff --git a/roles/juju-setup/templates/eth0.cfg.j2 b/roles/juju-setup/templates/eth0.cfg.j2
index 2cf2f33..94c1062 100644
--- a/roles/juju-setup/templates/eth0.cfg.j2
+++ b/roles/juju-setup/templates/eth0.cfg.j2
@@ -3,6 +3,7 @@
iface eth0 inet dhcp
{% if unbound_listen_on_default %}
dns-nameservers{% for host in groups['head'] %} {{ hostvars[host].ansible_default_ipv4.address }}{% endfor %}
+{% endif %}
{% if dns_servers is defined %}
dns-nameservers{% for ns in dns_servers %} {{ ns }}{% endfor %}
{% endif %}