tests: scsihost: Don't set LIBVIRT_FAKE_SYSFS_DIR
tests: scsihost: Don't set LIBVIRT_FAKE_SYSFS_DIR

The test program is not preloading any of the mock libraries that read
that environment variable, so setting it is pointless.

jfehlig/libvirt,nertpinx/libvirt,crobinso/libvirt,VenkatDatta/libvirt,datto/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,eskultety/libvirt,rlaager/libvirt,libvirt/libvirt,datto/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,datto/libvirt,jardasgit/libvirt,crobinso/libvirt,datto/libvirt,libvirt/libvirt,andreabolognani/libvirt,rlaager/libvirt,taget/libvirt,nertpinx/libvirt,taget/libvirt,taget/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,eskultety/libvirt,olafhering/libvirt,taget/libvirt,datto/libvirt,eskultety/libvirt,zippy2/libvirt,nertpinx/libvirt,eskultety/libvirt,taget/libvirt,jfehlig/libvirt,libvirt/libvirt,andreabolognani/libvirt,libvirt/libvirt,zippy2/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,olafhering/libvirt,nertpinx/libvirt,rlaager/libvirt,VenkatDatta/libvirt,eskultety/libvirt,rlaager/libvirt,olafhering/libvirt,crobinso/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,zippy2/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,olafhering/libvirt,andreabolognani/libvirt,jardasgit/libvirt,rlaager/libvirt,zippy2/libvirt,jfehlig/libvirt,crobinso/libvirt,VenkatDatta/libvirt