[Sheepdog] [PATCH 0/2] the super object removal

[FUJITA Tomonori]

We use the super object to manage the list of the existing VDIs.

Unlike data objects, the super object is a directory and the directory
is replicated on multiple nodes. I concluded that the super object
recovery code is too tricky and complicated.

So this patchset removes the super object. We manage the list of the
existing VDIs like p2p applications. At startup, the nodes build the
list of VDIs.

TODO: restart support

This is against the next branch. QEMU alos need the change for
this. I send a patch for QEMU next.