* util/bash-completion.d/grub-completion.bash.in: Add function to get completions from usage. Use LC_ALL=C to get options properly.
* Makefile.am: Add util/bash-completion.d directory * configure.ac: Likewise. * util/bash-completion.d/Makefile.am: New file. * util/bash-completion.d/grub-completion.bash.in: Likewise.