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support typed restriction of lv creation to specific pvs #422

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@sielicki

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@sielicki

lvcreate accepts a trailing argument [PhysicalVolumePath[:PE[-PE]]...] which can be used to restrict logical volume creation to specific physical volume(s).

This is the only really sensible way to create tiered storage for eg: cache creation, #421, but it can be useful in other complex scenarios.

Nothing prevents this from being used today via extraArguments, but it would drop types, ie: would rely on just using the same device string in extraArguments to pv creation as one used for the lv.

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