D23420: Use solid to check if a KFileItem is located on a network mount

[Méven Car]

meven marked an inline comment as done.

REPOSITORY
  R241 KIO

BRANCH
  arcpatch-D23420

REVISION DETAIL
  https://phabricator.kde.org/D23420

To: meven, dfaure, #frameworks
Cc: broulik, anthonyfieroni, kde-frameworks-devel, LeGast00n, GB_2, michaelh, 
ngraham, bruns