D5856: Use KDirWatch removeDir/addDir instead of stopDirScan/restartDirScan

[Albert Astals Cid]

aacid requested changes to this revision.
This revision now requires changes to proceed.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D5856

To: dfaure, aacid
Cc: #frameworks