Update Haiku definitions

Hello! Haiku released R1/beta1 on 28 September 2018

https://www.haiku-os.org/get-haiku/

Our latest nightly images also now support virtio network as well as virtio disk. (I wouldn't do virtio net for R1/beta1 since it was still unstable at the time of it's release.)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information