D11038: balooctl: Add clean option to remove stale file index entries

[James Smith]

smithjd abandoned this revision.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D11038

To: smithjd, #baloo, #frameworks, michaelh
Cc: michaelh, ashaposhnikov, astippich, spoorun, nicolasfella, ngraham, 
alexeymin