blkid returning 2 is not an error in this case

[cbudziszewski]

blkid returns error code 2 if a path does not exist, which causes puppet to bail and not remove the lv.

A similar issue was already fixed for resizing (https://github.com/puppetlabs/puppetlabs-lvm/pull/188/files).

It may be better to wrap the blkid call somehow, since it is used multiple times in the code and has more than one valid exit code.

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