Factor out seg->log_lv manipulation

Add attach_mirror_log()/detach_mirror_log()

With the recent changes to the internal stacking management, it's mandatory to update lv->segs_using_this_lv after seg->log_lv manipulation.

To avoid future problem, the attached patch changes internal _add/remove_mirror_log() to attach/detach_mirror_log() so that functions like lvconvert can use it.

Thanks,

Jun'ichi Nomura, NEC Corporation of America
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