Maint: hardcoded data in JSON embedded file

- Server information, versions and timestamps together in internal/constants/servers.json
- breaking change: updater cli uses -enduser instead of -file
- breaking change: updater cli uses -maintainer instead of -stdout
- Fix: replace special last a character with 'a' from Bogota for PrivateVPN
- Feat: do not write out servers and timestamp if no change was detected

internal/updater/providers/mullvad/string.go

@@ -1,14 +0,0 @@
-package mullvad
-
-import "github.com/qdm12/gluetun/internal/models"
-
-func Stringify(servers []models.MullvadServer) (s string) {
-	s = "func MullvadServers() []models.MullvadServer {\n"
-	s += "	return []models.MullvadServer{\n"
-	for _, server := range servers {
-		s += "		" + server.String() + ",\n"
-	}
-	s += "	}\n"
-	s += "}"
-	return s
-}

internal/updater/providers/mullvad/string_test.go

@@ -1,33 +0,0 @@
-package mullvad
-
-import (
-	"net"
-	"strings"
-	"testing"
-
-	"github.com/qdm12/gluetun/internal/models"
-	"github.com/stretchr/testify/assert"
-)
-
-func Test_Stringify(t *testing.T) {
-	servers := []models.MullvadServer{{
-		Country:  "webland",
-		City:     "webcity",
-		Hostname: "hostname",
-		ISP:      "not nsa",
-		Owned:    true,
-		IPs:      []net.IP{{1, 1, 1, 1}},
-		IPsV6:    []net.IP{{1, 1, 1, 1}},
-	}}
-	//nolint:lll
-	expected := `
-func MullvadServers() []models.MullvadServer {
-	return []models.MullvadServer{
-		{Country: "webland", City: "webcity", Hostname: "hostname", ISP: "not nsa", Owned: true, IPs: []net.IP{{1, 1, 1, 1}}, IPsV6: []net.IP{{1, 1, 1, 1}}},
-	}
-}
-`
-	expected = strings.TrimPrefix(strings.TrimSuffix(expected, "\n"), "\n")
-	s := Stringify(servers)
-	assert.Equal(t, expected, s)
-}