FIX: removed format errors in 32bit

nr_(max|cur)_batched_migration are fixed to 32bit wide
this values is limited by nr_segments
FIX
FIX
Merge branch 'feature/mikulas-format-32bit-error' into develop
Impl blockup on I/O error

Retry mechanism is preserved but
it immediately blocks up the whole system
if any device returns -EIO.

after block up
sysadmin must checkup the cause
and turn blockup switch to 0 to restart the system.
FIX: blockup: only sleep when -ENOMEM
Merge branch 'feature/mikulas-blockup-on-error' into develop