chimera: mark as-run if i_dirs_ipnfsid exists

Acked-by: Paul Millar
Target: master, 2.10, 2.9, 2.8, 2.7, 2.6
Require-book: no
Require-notes: no
(cherry picked from commit 1fb9ca4b089208bf9acef888d55014037860d91f)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Merge pull request #779 from kofemann/fix-chimera-index-2.8

chimera: mark as-run if i_dirs_ipnfsid exists