[Merge] ~arraybolt3/software-properties:ubuntu/master into software-properties:ubuntu/master

[Aaron Rainbolt]

Aaron Rainbolt has proposed merging ~arraybolt3/software-properties:ubuntu/master into software-properties:ubuntu/master.

Commit message:
Stop using KUrl and KFileDialog

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1795278 in software-properties (Ubuntu): "software-properties-{qt,kde} attempts to use KUrl but it doesn't exist"
  https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1795278

For more details, see:
https://code.launchpad.net/~arraybolt3/software-properties/+git/software-properties/+merge/438504

KUrl and KFileDialog both no longer are available to
software-properties-qt, but were used for the "Import Key File..."
button in the Authentication tab. This caused the button to break.
Removing the KUrl-related line and switching from KFileDialog to
QFileDialog resolves this problem. (LP: #1795278)
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~arraybolt3/software-properties:ubuntu/master into software-properties:ubuntu/master.
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