Maintenance: split each provider in a package

- Fix VyprVPN port
- Fix missing Auth overrides

internal/provider/fastestvpn/connection.go

@@ -0,0 +1,40 @@
+package fastestvpn
+
+import (
+	"github.com/qdm12/gluetun/internal/configuration"
+	"github.com/qdm12/gluetun/internal/constants"
+	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/provider/utils"
+)
+
+func (f *Fastestvpn) GetOpenVPNConnection(selection configuration.ServerSelection) (
+	connection models.OpenVPNConnection, err error) {
+	const port = 4443
+	protocol := constants.UDP
+	if selection.TCP {
+		protocol = constants.TCP
+	}
+
+	servers, err := f.filterServers(selection)
+	if err != nil {
+		return connection, err
+	}
+
+	var connections []models.OpenVPNConnection
+	for _, server := range servers {
+		for _, IP := range server.IPs {
+			connection := models.OpenVPNConnection{
+				IP:       IP,
+				Port:     port,
+				Protocol: protocol,
+			}
+			connections = append(connections, connection)
+		}
+	}
+
+	if selection.TargetIP != nil {
+		return utils.GetTargetIPConnection(connections, selection.TargetIP)
+	}
+
+	return utils.PickRandomConnection(connections, f.randSource), nil
+}