[PATCH] Fix a regression in '--nosync' option for mirrored LV

[Jun'ichi Nomura <j-nomura@ce.jp.nec.com>]

'--nosync' option of lvcreate is for skipping initial sync
of mirrors.
The option was implemented by passing the option to
create_mirror_log() function to control the initialization.
However, the new lv_add_mirrors() API didn't have a corresponding
option. So the option doesn't work properly.

This patch fixes it by adding a new flag for lv_add_mirrors(),
MIRROR_SKIP_INIT_SYNC, to skip initial sync.

Expected behavior is:
  * Default
      "Copy %" starts from 0 on create.
      "Copy %" resumes from the last status on reactivation.
  * '--corelog' only
      "Copy %" starts from 0 on create.
      "Copy %" starts from 0 on reactivation.
  * '--nosync' only
      "Copy %" starts from 100 on create.
      "Copy %" resumes from the last status on reactivation.
  * '--corelog' + '--nosync'
      "Copy %" starts from 100 on create.
      "Copy %" starts from 0 on reactivation.

Also attached is a test script for these combinations.
(Not in a 'make check' format as the script won't work on
 loopback devices which completes synchronization too fast.)

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America
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