lvmetad client side

Hi,

the attached patch is a semi-final version of the lvmetad integration. In lvmetad mode it gets through all the tests fine, without lvmetad I get a new failure in lvcreate-repair, somehow related to vgremove -ff. I'll investigate that tomorrow. There are some other issues that need to be sorted out, but I'll do these bits when this main blob is merged. At least a cursory review is still needed.

Petr

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id' Ash = Ash; id' Dust = Dust; id' _ = undefined