blkback needs Activations, from xenctrl.lwt

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #16 from djs55/fixes

blkback needs Activations, from xenctrl.lwt
Depend on ocamlfind xen-grant, xen-event rather than xenctrl

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

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

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
blkfront: assume running in mirage-xen for now

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #17 from djs55/disaggregate

Update to new xen-event, xen-grant packages