Maint: move Openvpn package files

- Move internal/openvpn/config/*.go to internal/openvpn/
- Move internal/openvpn/setup.go to internal/vpn/openvpn.go

internal/openvpn/stream.go

@@ -0,0 +1,53 @@
+package openvpn
+
+import (
+	"context"
+	"strings"
+
+	"github.com/qdm12/golibs/logging"
+)
+
+func streamLines(ctx context.Context, done chan<- struct{},
+	logger logging.Logger, stdout, stderr chan string,
+	tunnelReady chan<- struct{}) {
+	defer close(done)
+
+	var line string
+
+	for {
+		errLine := false
+		select {
+		case <-ctx.Done():
+			// Context should only be canceled after stdout and stderr are done
+			// being written to.
+			close(stdout)
+			close(stderr)
+			return
+		case line = <-stdout:
+		case line = <-stderr:
+			errLine = true
+		}
+		line, level := processLogLine(line)
+		if line == "" {
+			continue // filtered out
+		}
+		if errLine {
+			level = logging.LevelError
+		}
+		switch level {
+		case logging.LevelDebug:
+			logger.Debug(line)
+		case logging.LevelInfo:
+			logger.Info(line)
+		case logging.LevelWarn:
+			logger.Warn(line)
+		case logging.LevelError:
+			logger.Error(line)
+		}
+		if strings.Contains(line, "Initialization Sequence Completed") {
+			// do not close tunnelReady in case the initialization
+			// happens multiple times without Openvpn restarting
+			tunnelReady <- struct{}{}
+		}
+	}
+}