lvconvert mirror to wait for sync completion and remove temporary mirrors

With this patch, like pvmove, lvconvert mirror will wait for sync completion, showing progress periodically, and remove the temporary mirror after the completion.

If you don't like lvconvert to wait for sync completion, use '--background' option. '--interval <sec>' option is also available like pvmove.

If you stop lvconvert command, you can restart the polling daemon with 'lvconvert <LV name>'.

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