Correctly format ipv6 resolver config for lua
Correctly format ipv6 resolver config for lua

It seems that when support was added for parsing resolv_conf directly a regression was introduced which effectively breaks anyone with ipv6 resolvers.

Regression of #3895

kubernetes/ingress-nginx,kubernetes/ingress-nginx,caicloud/ingress,aledbf/ingress-nginx,caicloud/ingress,canhnt/ingress,caicloud/ingress,aledbf/ingress-nginx,kubernetes/ingress-nginx,aledbf/ingress-nginx,kubernetes/ingress-nginx,aledbf/ingress-nginx,canhnt/ingress,canhnt/ingress,caicloud/ingress,kubernetes/ingress-nginx,canhnt/ingress