Sync python-apt 0.9.3.3 (main) from Debian unstable (main)

Please sync python-apt 0.9.3.3 (main) from Debian unstable (main)

Explanation of the Ubuntu delta and why it can be dropped:

I completely merged the two Ubuntu updates into Debian, there
are no other changes.

Changelog entries since current trusty version 0.9.3.2ubuntu2:

python-apt (0.9.3.3) unstable; urgency=medium

  [ Steve Langasek ]
  * aptsources/sourceslist.py: ensure that our sources are opened with UTF-8
    encoding, regardless of the current locale, and handle the sources lines
    as Unicode internally for consistency between python2 and python3.
    LP: #1069019.

  [ Brian Murray ]
  * Fix pep8 error.

 -- Julian Andres Klode <email address hidden> Sat, 15 Mar 2014 18:53:58 +0100