Add "get-zone" command (#613)

* Add GetZoneRecords to DNSProvider interface
* dnscontrol now uses ufave/cli/v2
* NEW: get-zones.md
* HasRecordTypeName should be a method on models.Records not models.DomainConfig
* Implement BIND's GetZoneRecords
* new WriteZoneFile implemented
* go mod vendor
* Update docs to use get-zone instead of convertzone
* Add CanGetZone capability and update all providers.
* Get all zones for a provider at once (#626)
* implement GetZoneRecords for cloudflare
* munge cloudflare ttls
* Implement GetZoneRecords for cloudflare (#625)

Co-authored-by: Craig Peterson <192540+captncraig@users.noreply.github.com>

providers/providers.go

@@ -24,6 +24,13 @@ type DomainCreator interface {
 	EnsureDomainExists(domain string) error
 }
 
+// DomainLister should be implemented by providers that have the
+// ability to list the zones they manage. This facilitates using the
+// "get-zones" command for "all" zones.
+type ZoneLister interface {
+	ListZones() ([]string, error)
+}
+
 // RegistrarInitializer is a function to create a registrar. Function will be passed the unprocessed json payload from the configuration file for the given provider.
 type RegistrarInitializer func(map[string]string) (Registrar, error)
 
@@ -85,6 +92,14 @@ func (n None) GetNameservers(string) ([]*models.Nameserver, error) {
 	return nil, nil
 }
 
+// GetZoneRecords gets the records of a zone and returns them in RecordConfig format.
+func (client None) GetZoneRecords(domain string) (models.Records, error) {
+	return nil, fmt.Errorf("not implemented")
+	// This enables the get-zones subcommand.
+	// Implement this by extracting the code from GetDomainCorrections into
+	// a single function.  For most providers this should be relatively easy.
+}
+
 // GetDomainCorrections returns corrections to update a domain.
 func (n None) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Correction, error) {
 	return nil, nil