Function create_task 

pub fn create_task<F>(
    kernel: &Kernel,
    initial_name: TaskCommand,
    root_fs: Arc<FsContext>,
    task_info_factory: F,
    creds: Arc<Credentials>,
) -> Result<TaskBuilder, Errno>
where
    F: FnOnce(i32, Arc<ProcessGroup>) -> Result<TaskInfo, Errno>,