Use logrusr instead of zap.

logrusr is a open source convertor, which can convert logrus logger into logr.
By using logrusr, velero can use exsiting formatted logrus logger, other than introducing zap as a new logger.

Signed-off-by: Xun Jiang <jxun@vmware.com>

pkg/cmd/server/server.go

@@ -27,6 +27,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/bombsimon/logrusr"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/sirupsen/logrus"
@@ -73,7 +74,6 @@ import (
 
 	ctrl "sigs.k8s.io/controller-runtime"
 
-	"sigs.k8s.io/controller-runtime/pkg/log/zap"
 	"sigs.k8s.io/controller-runtime/pkg/manager"
 
 	"github.com/vmware-tanzu/velero/internal/storage"
@@ -303,7 +303,7 @@ func newServer(f client.Factory, config serverConfig, logger *logrus.Logger) (*s
 	velerov1api.AddToScheme(scheme)
 	corev1api.AddToScheme(scheme)
 
-	ctrl.SetLogger(zap.New())
+	ctrl.SetLogger(logrusr.NewLogger(logger))
 
 	mgr, err := ctrl.NewManager(clientConfig, ctrl.Options{
 		Scheme:    scheme,