Update to xenstore interface in 1.2.3

'with_xs' becomes 'immediate'
'with_xst' becomes 'transaction'

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Release 0.9.23

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

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge branch 'master' of git://github.com/xapi-project/xenopsd