By default it will use cznic/kv. But if you want to use something else
(like MySQL, or leveldb, or Postgres, or Mongo), you can.
Change-Id: I8ce3571a701717ffde3b80856c72a9e3223ab439
Add use into localdisk (diskpacked already uses it).
Add ErrNotImplemented error for blobserver and mention the possibility
for RemoveBlobs (diskpacked deficit).
Change-Id: I6a50f263a58c8d3d1611ff9a060ea9fa4aee6163
Regressed from rev cb6f423e. Eventually pkg storagetest should test all methods of blobserver.Storage
for all storage target types.
Change-Id: I2c1c93b76fd9280a3eb429b1d71c64a693ed1ace
Brad Fitzpatrick