[lxc-devel] add '-m | --menuconfig' functionality to lxc-create

[Sheng Yong]

Hi, all

These 4 patches create interactive interface for lxc-create. lxdialog
and mconf are used directly from linux kernel. mconf and corresponding
config file are installed at $datadir/lxc/scripts/.

'-m | --menuconfig' option forks a new task and executes mconf. After
menuconfig, a default .config file is saved at the current directory.
lxc-create reads and parses .config, then fills the lxc_arguments.

thanks,
shyodx