Maint: configuration Openvpn selection structure

- Move network protocol from ServerSelection to OpenVPNSelection child
- Move PIA encryption preset from ServerSelection to OpenVPNSelection child
- Move custom port from ServerSelection to OpenVPNSelection child

internal/provider/cyberghost/connection.go

@@ -11,7 +11,7 @@ func (c *Cyberghost) GetOpenVPNConnection(selection configuration.ServerSelectio
 	connection models.OpenVPNConnection, err error) {
 	const port = 443
 	protocol := constants.UDP
-	if selection.TCP {
+	if selection.OpenVPN.TCP {
 		protocol = constants.TCP
 	}
 

internal/provider/cyberghost/filter.go

@@ -16,7 +16,7 @@ var ErrGroupMismatchesProtocol = errors.New("server group does not match protoco
 func (c *Cyberghost) filterServers(selection configuration.ServerSelection) (
 	servers []models.CyberghostServer, err error) {
 	if len(selection.Groups) == 0 {
-		if selection.TCP {
+		if selection.OpenVPN.TCP {
 			selection.Groups = tcpGroupChoices()
 		} else {
 			selection.Groups = udpGroupChoices()
@@ -25,7 +25,7 @@ func (c *Cyberghost) filterServers(selection configuration.ServerSelection) (
 
 	// Check each group match the protocol
 	groupsCheckFn := groupsAreAllUDP
-	if selection.TCP {
+	if selection.OpenVPN.TCP {
 		groupsCheckFn = groupsAreAllTCP
 	}
 	if err := groupsCheckFn(selection.Groups); err != nil {

internal/provider/cyberghost/filter_test.go

@@ -41,7 +41,9 @@ func Test_Cyberghost_filterServers(t *testing.T) {
 				{Region: "d", Group: "Premium UDP Europe"},
 			},
 			selection: configuration.ServerSelection{
-				TCP: true,
+				OpenVPN: configuration.OpenVPNSelection{
+					TCP: true,
+				},
 			},
 			filteredServers: []models.CyberghostServer{
 				{Region: "a", Group: "Premium TCP Asia"},