Support bucket versioning (#9377)

- Implement a new xl.json 2.0.0 format to support,
  this moves the entire marshaling logic to POSIX
  layer, top layer always consumes a common FileInfo
  construct which simplifies the metadata reads.
- Implement list object versions
- Migrate to siphash from crchash for new deployments
  for object placements.

Fixes #2111

Dockerfile.dev.browser

@@ -10,4 +10,3 @@ ENV PATH=$PATH:/root/go/bin
 
 RUN go get github.com/go-bindata/go-bindata/go-bindata && \
     go get github.com/elazarl/go-bindata-assetfs/go-bindata-assetfs
-