Imports
- github.com/golang/glog
- k8s.io/client-go/kubernetes
- github.com/jetstack-experimental/cert-manager/pkg/issuer/acme/dns/route53
- github.com/jetstack-experimental/cert-manager/pkg/apis/certmanager/v1alpha1
- github.com/jetstack-experimental/cert-manager/pkg/issuer/acme/dns/clouddns
- github.com/jetstack-experimental/cert-manager/pkg/issuer/acme/dns/util
- k8s.io/client-go/listers/core/v1
- github.com/jetstack-experimental/cert-manager/pkg/issuer/acme/dns/cloudflare