[Merge] lp:~sjakthol/software-properties/fix-1073728 into lp:software-properties

[Sami Jaktholm]

Sami Jaktholm has proposed merging lp:~sjakthol/software-properties/fix-1073728 into lp:software-properties.

Commit message:
-gtk: Open APT cache and detect drivers in a background thread asynchronously
      when user opens the Additional Drivers tab. This speeds up the startup
      considerably.

      Fixes LP: #1073728.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1073728 in software-properties (Ubuntu): "software sources window takes long time to open with little user feedback"
  https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1073728

For more details, see:
https://code.launchpad.net/~sjakthol/software-properties/fix-1073728/+merge/165737

Here this dropped the startup time from 6.5 seconds to 0.3 seconds.
-- 
https://code.launchpad.net/~sjakthol/software-properties/fix-1073728/+merge/165737
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~sjakthol/software-properties/fix-1073728 into lp:software-properties.
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