[sheepdog] Add confirm before format cluster

Valerio Pachera sirio81 at gmail.com
Wed Dec 12 17:09:16 CET 2012

Hi, I suggest to add a message before format the cluster (at least if
it contains any vdi).

collie vdi create test 1G
collie vdi list
  Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
  test         1  1.0 GB  0.0 MB  0.0 MB 2012-12-12 17:00   7c2b25
collie cluster format
  using backend farm store

This just to avoid a mistake that can be done if working late and being tired:
instead of typing the harmless
  'collie cluster info'
  'collie cluster format'

...and loose everything!

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