BUGFIX: test with segment size order 7 passed

FIX!!!
after recovering
it doesn't stop migration.
Full speed read from SSD continues
Save
FIXED: add sizeof_* macros in segment.h and fix bug
BUGFIX: recovering metadata with segment size order 7 is passed

- In resume, ordering is very important.
  Putting recover_cache no migrate worker initizalied ahead
  stalls.
  Since recovering metadata needs a migration.
- Two FIXME memo left
Merge branch 'feature/fix-metadata-collapse-if-small-segment-size' into develop