Maint: minor changes to openvpn/config package

- Constructor returns concrete struct instead of interface
- Rename conf to openvpnConf in openvpn loop

internal/openvpn/config/auth.go

@@ -11,7 +11,7 @@ type AuthWriter interface {
 }
 
 // WriteAuthFile writes the OpenVPN auth file to disk with the right permissions.
-func (c *configurator) WriteAuthFile(user, password string) error {
+func (c *Configurator) WriteAuthFile(user, password string) error {
 	file, err := os.Open(c.authFilePath)
 
 	if err != nil && !os.IsNotExist(err) {

internal/openvpn/config/command.go

@@ -23,7 +23,7 @@ type Starter interface {
 		stdoutLines, stderrLines chan string, waitError chan error, err error)
 }
 
-func (c *configurator) Start(ctx context.Context, version string, flags []string) (
+func (c *Configurator) Start(ctx context.Context, version string, flags []string) (
 	stdoutLines, stderrLines chan string, waitError chan error, err error) {
 	var bin string
 	switch version {
@@ -50,17 +50,17 @@ type VersionGetter interface {
 	Version25(ctx context.Context) (version string, err error)
 }
 
-func (c *configurator) Version24(ctx context.Context) (version string, err error) {
+func (c *Configurator) Version24(ctx context.Context) (version string, err error) {
 	return c.version(ctx, binOpenvpn24)
 }
 
-func (c *configurator) Version25(ctx context.Context) (version string, err error) {
+func (c *Configurator) Version25(ctx context.Context) (version string, err error) {
 	return c.version(ctx, binOpenvpn25)
 }
 
 var ErrVersionTooShort = errors.New("version output is too short")
 
-func (c *configurator) version(ctx context.Context, binName string) (version string, err error) {
+func (c *Configurator) version(ctx context.Context, binName string) (version string, err error) {
 	cmd := exec.CommandContext(ctx, binName, "--version")
 	output, err := c.cmder.Run(cmd)
 	if err != nil && err.Error() != "exit status 1" {

internal/openvpn/config/config.go

@@ -9,7 +9,7 @@ type Writer interface {
 	WriteConfig(lines []string) error
 }
 
-func (c *configurator) WriteConfig(lines []string) error {
+func (c *Configurator) WriteConfig(lines []string) error {
 	file, err := os.OpenFile(c.configPath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
 	if err != nil {
 		return err

internal/openvpn/config/openvpn.go

@@ -6,14 +6,14 @@ import (
 	"github.com/qdm12/golibs/logging"
 )
 
-type Configurator interface {
+type Interface interface {
 	VersionGetter
 	AuthWriter
 	Starter
 	Writer
 }
 
-type configurator struct {
+type Configurator struct {
 	logger       logging.Logger
 	cmder        command.RunStarter
 	configPath   string
@@ -21,9 +21,9 @@ type configurator struct {
 	puid, pgid   int
 }
 
-func NewConfigurator(logger logging.Logger,
-	cmder command.RunStarter, puid, pgid int) Configurator {
-	return &configurator{
+func New(logger logging.Logger,
+	cmder command.RunStarter, puid, pgid int) *Configurator {
+	return &Configurator{
 		logger:       logger,
 		cmder:        cmder,
 		configPath:   constants.OpenVPNConf,