Remove leftover mirror log on creation failure

When a creation of mirrored LV fails during its course, mirror log LV is left unremoved.
The patch removes the log LV if error occurs after commiting it.

# dmsetup create --notable testvg-lv0_mlog
# lvcreate -l1 -m1 -nlv0 testvg
  device-mapper: create ioctl failed: Device or resource busy
  Aborting. Failed to activate mirror log. Remove new LVs and retry.
  Failed to create mirror log.
# lvs -a
  LV       VG     Attr   LSize Origin Snap%  Move Log Copy% 
  lv0_mlog testvg -wi-d- 4.00M

Thanks,

Jun'ichi Nomura, NEC Corporation of America
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