fix: Do not create base folder on remote when uploading dir

Calling lxc files push dir/ instance:/tmp/abc will create folder
/tmp/abc/dir with all files inside which does not match behavior
expected by Packer - files should be placed directly under /tmp/abc.

Use lxc files push dir/* to upload files to proper directory

builder/lxd/communicator.go

@@ -92,7 +92,7 @@ func (c *Communicator) Upload(dst string, r io.Reader, fi *os.FileInfo) error {
 
 func (c *Communicator) UploadDir(dst string, src string, exclude []string) error {
 	fileDestination := fmt.Sprintf("%s/%s", c.ContainerName, dst)
-	pushCommand := fmt.Sprintf("lxc file push --debug -pr %s %s", src, fileDestination)
+	pushCommand := fmt.Sprintf("lxc file push --debug -pr %s* %s", src, fileDestination)
 	log.Printf(pushCommand)
 	cp, err := c.CmdWrapper(pushCommand)
 	if err != nil {