Map V-level logging to logrus named logging

After looking at the code for other logr implementations such as zapr
and zerologr it makes more sens that logrus also should try to map logr
V-level logging to named logging as close as possible.

* V0 is kept as severity Info
* V1 is logged as severity Debug
* V2 is logged as severity Trace

logrusr.go

@@ -109,9 +109,15 @@ func (l *logrusr) Info(level int, msg string, keysAndValues ...interface{}) {
 		l.logger = l.logger.WithField("caller", c)
 	}
 
-	l.logger.
-		WithFields(listToLogrusFields(l.defaultFormatter, keysAndValues...)).
-		Info(msg)
+	log := l.logger.WithFields(listToLogrusFields(l.defaultFormatter, keysAndValues...))
+
+	if level <= 0 {
+		log.Info(msg)
+	} else if level == 1 {
+		log.Debug(msg)
+	} else {
+		log.Trace(msg)
+	}
 }
 
 // Error logs error messages. Since the log will be written with `Error` level

logrusr_test.go

@@ -87,10 +87,27 @@ func TestLogging(t *testing.T) {
 				return logrus.New()
 			},
 			logFunc: func(log logr.Logger) {
+				log.V(1).Info("hello, world")
 				log.V(2).Info("hello, world")
 			},
 			assertions: nil,
 		},
+		{
+			description: "V(1) logging with debug level set is shown",
+			logrusLogger: func() logrus.FieldLogger {
+				l := logrus.New()
+				l.SetLevel(logrus.TraceLevel)
+
+				return l
+			},
+			logFunc: func(log logr.Logger) {
+				log.V(1).Info("hello, world")
+			},
+			assertions: map[string]string{
+				"level": "debug",
+				"msg":   "hello, world",
+			},
+		},
 		{
 			description: "V(2) logging with trace level set is shown",
 			logrusLogger: func() logrus.FieldLogger {
@@ -103,7 +120,7 @@ func TestLogging(t *testing.T) {
 				log.V(2).Info("hello, world")
 			},
 			assertions: map[string]string{
-				"level": "info",
+				"level": "trace",
 				"msg":   "hello, world",
 			},
 		},