Work around slowness in the KDE 5 test
Work around slowness in the KDE 5 test

The use of unionfs-fuse (57a0f140643cde409022e297ed05e05f8d34d778)
slows down the KDE 5 test enough that it hits Hydra timeouts. (E.g. on
my laptop it went from ~5 min to ~30 min.) So disable it for the KDE
test.

http://hydra.nixos.org/build/45127422
(cherry picked from commit 3fcbcf25568cd629644a680562f47762d1ae15b2)

SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs