D10410: Move the task of cleaning up of socket file to file ioslave and FdReceiver

[Chinmoy Ranjan Pradhan]

chinmoyr removed a dependency: D9966: [KIO] Fix issues with sharing of file 
descriptor.

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D10410

To: chinmoyr, #frameworks, ossi, dfaure
Cc: kde-frameworks-devel, michaelh, ngraham, bruns