Fix a regression in '--nosync' option for mirrored LV

'--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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