Ensure DRBD sync before resizing volumes on thick provisoned linstor SR #105
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When resizing a VDI on a thick provisioned linstor SR, we need to wait for DRBD to be up to date.
This is dependent on previous operations that we can't know.
If we wait too much, we stop and return an error to the user letting him know that he needs to try later.
Also fix an issue when resizing raw images.