Fix 'lvchange --resync'

Fix 'lvchange --resync' breakage (since 2.02.30)

# lvchange --resync vg/lv
  LV lv_mlog is used by LV lv:0, but missing ptr from lv to lv_mlog
  Internal error: LV segments corrupted in lv_mlog.
  Failed to write intermediate VG metadata.

When changing seg->log_lv, it needs to do corresponding add_seg_to_segs_using_this_lv/remove_seg_from_segs_using_this_lv. Without them, the metadata validator will detect inconsistency and report like the above.

Attached patch fixes the issue.

Thanks,

Jun'ichi Nomura, NEC Corporation of America
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