[sheepdog] Sheepdog 0.5.0 schedule and todos

[MORITA Kazutaka]

Hi all,

I think of releasing 0.5.0 on the early September.

TODO items for the release are:
 - different redundancy level for each VDI
 - 'collie cluster recover' to enable/disable automatic recovery
 - 'collie vdi backup/restore' to get a differential backup between snapshots
 - another writeback support in backend store
 - fix a blocking problem in farm
 - fix mastership transfer

Let me know if there are any opinions.

Thanks,

Kazutaka