When parsing packets, the payload length must be between 0 and xenstore_payload_max
When parsing packets, the payload length must be between 0 and xenstore_payload_max

This is functionally equivalent to xen-unstable.hg c/s ffd30e7388ad

mirage/ocaml-xenstore-server,mirage/ocaml-xenstore-server,djs55/ocaml-xenstore-server