Depend on new ocamlfind packages xen-event, xen-grant

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
grant: use the standard spelling of 'writable'

Previously we spelled it both 'writeable' and 'writable'.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Regenerate OASIS

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge branch 'disaggregate' of git://github.com/djs55/mirage-net-xen

Conflicts:
	_oasis
	_tags
	lib/META
	setup.ml