vendor: sirupsen/logrus -> Sirupsen/logrus

github.com/docker/docker/pkg/archive requires Sirupsen/logrus.
So let's remove sirupsen/logrus at the moment.

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

vendor/github.com/sirupsen/logrus/writer.go

@@ -1,53 +0,0 @@
-package logrus
-
-import (
-	"bufio"
-	"io"
-	"runtime"
-)
-
-func (logger *Logger) Writer() *io.PipeWriter {
-	return logger.WriterLevel(InfoLevel)
-}
-
-func (logger *Logger) WriterLevel(level Level) *io.PipeWriter {
-	reader, writer := io.Pipe()
-
-	var printFunc func(args ...interface{})
-	switch level {
-	case DebugLevel:
-		printFunc = logger.Debug
-	case InfoLevel:
-		printFunc = logger.Info
-	case WarnLevel:
-		printFunc = logger.Warn
-	case ErrorLevel:
-		printFunc = logger.Error
-	case FatalLevel:
-		printFunc = logger.Fatal
-	case PanicLevel:
-		printFunc = logger.Panic
-	default:
-		printFunc = logger.Print
-	}
-
-	go logger.writerScanner(reader, printFunc)
-	runtime.SetFinalizer(writer, writerFinalizer)
-
-	return writer
-}
-
-func (logger *Logger) writerScanner(reader *io.PipeReader, printFunc func(args ...interface{})) {
-	scanner := bufio.NewScanner(reader)
-	for scanner.Scan() {
-		printFunc(scanner.Text())
-	}
-	if err := scanner.Err(); err != nil {
-		logger.Errorf("Error while reading from Writer: %s", err)
-	}
-	reader.Close()
-}
-
-func writerFinalizer(writer *io.PipeWriter) {
-	writer.Close()
-}