This commit updates all scripts using mixed indent to a consistent
4 spaces indent.

In the past quite a few of those scripts used tabs to instead of 8 spaces or
instead of 4 spaces, sometimes mixing those in the same line and sometimes
changing the tab width within the same file.
Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>