sbin/hammer: Print key_end.lo instead of key_beg.lo on reblock

sbin/hammer: Print key_end.lo instead of key_beg.lo on reblock

- Print reblock.key_end.localization when reblock starts instead of
  reblock.key_beg.localization.

- hammer reblock printing 0000 while reblock-inodes printing 0001
  and reblock-data|dirs printing 0002 seems strange because reblock
  covers all localization types ranging from MIN(0000) to MAX(ffff)
  on btree iteration (which obviously includes existing two types
  for inode and misc). Printing end localization should make better
  sense here.