Revert "nixos: add setuid wrappers for some networked filesystems' helpers"

This reverts commit 26a4001a98322ab903b8186b97f33c5b282828a5. It
breaks the NFS test:

http://hydra.nixos.org/build/13943148

Also, having more setuid programs is a bad thing security-wise.

Changed files
+1 -3
nixos
modules
+1 -3
nixos/modules/security/setuid-wrappers.nix
···
config = {
security.setuidPrograms =
-
[ "mount.nfs" "mount.nfs4" "mount.cifs"
-
"fusermount" "umount"
-
"wodim" "cdrdao" "growisofs" ];
+
[ "fusermount" "wodim" "cdrdao" "growisofs" ];
system.activationScripts.setuid =
let