domblkstat: Produce error message that at least sounds like English
domblkstat: Produce error message that at least sounds like English

Compare:

  # virsh domblkstat freebsd hdd
  error: Failed to get block stats freebsd hdd
  error: invalid argument: invalid path: hdd

with:

  # virsh domblkstat freebsd hdd
  error: Failed to get block stats for domain 'freebsd' device 'hdd'
  error: invalid argument: invalid path: hdd

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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