D21002: Remove kde4 migration agent completely

[Stefan Brüns]

bruns added a reviewer: ngraham.

REPOSITORY
  R311 KWallet

REVISION DETAIL
  https://phabricator.kde.org/D21002

To: bruns, #frameworks, cfeck, ngraham
Cc: kde-frameworks-devel, damjang, LeGast00n, michaelh, ngraham, bruns