bash-completion: add bash completetion configure option

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
bash-completion: disk-utils

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
bash-completion: fdisks

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
bash-completion: login-utils

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
bash-completion: misc-utils

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
bash-completion: schedutils

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
bash-completion: sys-utils

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
bash-completion: term-utils

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
bash-completion: text-utils

Signed-off-by: Sami Kerola <kerolasa@iki.fi>
bash-completion: add completion files to Makefile.am

And remove shell completion TODO item.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>