pythonconsole: Convert from tabs to spaces

I’m really sorry this is necessary. pylint made me do it.

Helps: https://bugzilla.gnome.org/show_bug.cgi?id=708275
pythonconsole: pylintify the code

Shut up, pylint.

Helps: https://bugzilla.gnome.org/show_bug.cgi?id=708275
opensubtitles: pylintify the code

Shut up, pylint.

Helps: https://bugzilla.gnome.org/show_bug.cgi?id=708275
dbusservice: pylintify the code

Shut up, pylint.

Helps: https://bugzilla.gnome.org/show_bug.cgi?id=708275
pylint 1.0.0 doesn't have the -i option, remove it

Closes: https://bugzilla.gnome.org/show_bug.cgi?id=708275
plugins: Remove ‘check-pylint’ as a prerequisite of ‘check’

pylint can be useful, but since the initial round of fixes it’s just been
noise. Tools run by `make check` should be useful, not a hurdle.

Helps: https://bugzilla.gnome.org/show_bug.cgi?id=708275