Cloud Plugin: Gateway should store meta data and indices under the same container

[bjon]

Seems like the restriction I thought was in place in S3 (others don't have restriction) regarding the number of files in a bucket has been removed. There is a restriction for number of buckets though, so creating a bucket for metadata, and 2 buckets per shard does not make sense.

Everything should be stored under the same bucket. With the option, on the index leve, to store it on a different bucket if configured.

Sadly, this breaks backward... . So a reindex should be done.

[kimchy]

Cloud Plugin: Gateway should store meta data and indices under the same container, closed by c7075c1.