chore(updater): common GetServers signature

- Log warnings when running outside of CLI mode
- Remove updater CLI bool setting
- Warnings are logged in updating functions

internal/provider/perfectprivacy/updater/servers.go

@@ -9,13 +9,12 @@ import (
 
 	"github.com/qdm12/gluetun/internal/models"
 	"github.com/qdm12/gluetun/internal/updater/openvpn"
-	"github.com/qdm12/gluetun/internal/updater/unzip"
 )
 
 var ErrNotEnoughServers = errors.New("not enough servers found")
 
-func GetServers(ctx context.Context, unzipper unzip.Unzipper, minServers int) (
-	servers []models.Server, warnings []string, err error) {
+func (u *Updater) GetServers(ctx context.Context, minServers int) (
+	servers []models.Server, err error) {
 	zipURL := url.URL{
 		Scheme: "https",
 		Host:   "www.perfect-privacy.com",
@@ -28,9 +27,9 @@ func GetServers(ctx context.Context, unzipper unzip.Unzipper, minServers int) (
 	values.Set("protocol", "udp") // all support both TCP and UDP
 	zipURL.RawQuery = values.Encode()
 
-	contents, err := unzipper.FetchAndExtract(ctx, zipURL.String())
+	contents, err := u.unzipper.FetchAndExtract(ctx, zipURL.String())
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 
 	cts := make(cityToServer)
@@ -38,12 +37,12 @@ func GetServers(ctx context.Context, unzipper unzip.Unzipper, minServers int) (
 	for fileName, content := range contents {
 		err := addServerFromOvpn(cts, fileName, content)
 		if err != nil {
-			warnings = append(warnings, fileName+": "+err.Error())
+			u.warner.Warn(err.Error() + " in " + fileName)
 		}
 	}
 
 	if len(cts) < minServers {
-		return nil, warnings, fmt.Errorf("%w: %d and expected at least %d",
+		return nil, fmt.Errorf("%w: %d and expected at least %d",
 			ErrNotEnoughServers, len(cts), minServers)
 	}
 
@@ -51,7 +50,7 @@ func GetServers(ctx context.Context, unzipper unzip.Unzipper, minServers int) (
 
 	sortServers(servers)
 
-	return servers, warnings, nil
+	return servers, nil
 }
 
 func addServerFromOvpn(cts cityToServer,