replace run_in_target with chroot.
remove kernel_ml_aufs_version.
remove unnecessary tests.
remove "local" in install_menu_lst_kernel_ml_aufs.
remove chroot-specific path in install_menu_lst_kernel_ml_aufs.
remove install_menu_lst_kernel_ml_aufs.
remove unnecessary code.
use if-statement.
Merge pull request #52 from hansode/feature-docker-io

Feature docker io