Compile against xenstore-1.2.1

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Bump version to 0.9.2

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Regenerate OASIS
Merge branch 'stable' of git://github.com/xen-org/message-switch

Conflicts:
	ChangeLog
	setup.ml
	switch/switch.ml