add mount log (#4101)

* filer.backup use replication.source.filer

* add mount log

* Revert "filer.backup use replication.source.filer"

This reverts commit 07bf6f956c.

* fix

Co-authored-by: zemul <zhouzemiao@ihuman.com>

weed/command/mount_std.go

@@ -256,7 +256,8 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 
 	seaweedFileSystem.StartBackgroundTasks()
 
-	fmt.Printf("This is SeaweedFS version %s %s %s\n", util.Version(), runtime.GOOS, runtime.GOARCH)
+	glog.V(0).Infof("mounted %s%s to %v", *option.filer, mountRoot, dir)
+	glog.V(0).Infof("This is SeaweedFS version %s %s %s", util.Version(), runtime.GOOS, runtime.GOARCH)
 
 	server.Serve()