bash_completion: Generate more compact version

First the numbers:
$ stat --format '%s %n' doc/examples/bash_completion*
77847 doc/examples/bash_completion
86492 doc/examples/bash_completion-debug

The non-debug version doesn't use indentation and does not have some
(primitive) facilities for debugging. The savings are about 8.5 kB or
10 %. The “-debug” version is used by “devel/upload”.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>