[Merge] lp:~anders-kaseorg/update-notifier/apt-check-speed into lp:update-notifier

[Anders Kaseorg]

Those are already read by default (pkgCacheFile::Open → pkgCacheFile::BuildPolicy → ReadPinFile, ReadPinDir). There’s no need to read them again. I tested that my version still respects pins.
-- 
https://code.launchpad.net/~anders-kaseorg/update-notifier/apt-check-speed/+merge/188555
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~anders-kaseorg/update-notifier/apt-check-speed into lp:update-notifier.