Requesting ballots for #31 and #32

Hi,
I'd like to request ballots for the following issues:

"content: reserve virtio device ID for file system devices"
https://github.com/oasis-tcs/virtio-spec/issues/31

"virtio-blk: discard and write zeroes clarifications"
https://github.com/oasis-tcs/virtio-spec/issues/32

At least #32 is needed for VIRTIO 1.1 but #31 is trivial and will
prevent device ID conflicts so I suggest merging it too.

Thank you,
Stefan