Loops and HTTP control server rework (#308)

- CRUD REST HTTP server
- `/v1` HTTP server prefix
- Retrocompatible with older routes (redirects to v1 or handles the requests directly)
- DNS, Updater and Openvpn refactored to have a REST-like state with new methods to change their states synchronously
- Openvpn, Unbound and Updater status, see #287

internal/updater/updater.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/settings"
 	"github.com/qdm12/golibs/logging"
 	"github.com/qdm12/golibs/network"
 )
@@ -17,7 +18,7 @@ type Updater interface {
 
 type updater struct {
 	// configuration
-	options Options
+	options settings.Updater
 
 	// state
 	servers models.AllServers
@@ -30,11 +31,12 @@ type updater struct {
 	client   network.Client
 }
 
-func New(options Options, httpClient *http.Client, currentServers models.AllServers, logger logging.Logger) Updater {
-	if len(options.DNSAddress) == 0 {
-		options.DNSAddress = "1.1.1.1"
+func New(settings settings.Updater, httpClient *http.Client,
+	currentServers models.AllServers, logger logging.Logger) Updater {
+	if len(settings.DNSAddress) == 0 {
+		settings.DNSAddress = "1.1.1.1"
 	}
-	resolver := newResolver(options.DNSAddress)
+	resolver := newResolver(settings.DNSAddress)
 	const clientTimeout = 10 * time.Second
 	return &updater{
 		logger:   logger,
@@ -42,7 +44,7 @@ func New(options Options, httpClient *http.Client, currentServers models.AllServ
 		println:  func(s string) { fmt.Println(s) },
 		lookupIP: newLookupIP(resolver),
 		client:   network.NewClient(clientTimeout),
-		options:  options,
+		options:  settings,
 		servers:  currentServers,
 	}
 }