Check that we can attach volumes that we have created by clone.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
storage test: check that VDI.clone creates exactly 1 new VDI

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
storage: add an SR.stat, to query overall SR statistics.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Update to 0.9.8

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

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