Polldaemon configurable progress title

polldaemon, which is used by pvmove, prints "Moved: x%" periodically to show the progress of its work.
However, it can be used for other purpose like waiting for sync completion of newly added mirror.
This patch change the strings "Moved" configurable by
a parameter passed to poll_daemon().

This is prepration for the next patch which changes lvconvert to use polldaemon.

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