Refactor RecordConfig: Add getters/setters (#314)

* Replace RecordConfig.Name and .NameFQDN with getters and setters.
* Replace RecordConfig.Target with getters and setters.
* Eliminate the CombinedTarget concept.
* Add RecordConfig.PopulateFromString to reduce code in all providers.
* encode and decode name.com txt records (#315)
* Replace fmt.Errorf with errors.Errorf

models/util.go

@@ -0,0 +1,29 @@
+package models
+
+import (
+	"bytes"
+	"encoding/gob"
+	"strconv"
+
+	"github.com/pkg/errors"
+)
+
+func copyObj(input interface{}, output interface{}) error {
+	buf := &bytes.Buffer{}
+	enc := gob.NewEncoder(buf)
+	dec := gob.NewDecoder(buf)
+	if err := enc.Encode(input); err != nil {
+		return err
+	}
+	return dec.Decode(output)
+}
+
+// atou32 converts a string  to uint32 or panics.
+// DEPRECATED: This will go away when SOA record handling is rewritten.
+func atou32(s string) uint32 {
+	i64, err := strconv.ParseUint(s, 10, 32)
+	if err != nil {
+		panic(errors.Errorf("atou32 failed (%v) (err=%v", s, err))
+	}
+	return uint32(i64)
+}