Get rid of the cortex fork with lazy loading upstreamed (#596)

Gopkg.lock

Gopkg.toml

...exproject/cortex/pkg/chunk/aws/dynamodb_storage_client.go

vendor/github.com/cortexproject/cortex/pkg/chunk/fixtures.go

...thub.com/cortexproject/cortex/pkg/chunk/local/fixtures.go

...ithub.com/cortexproject/cortex/pkg/chunk/schema_config.go

...github.com/cortexproject/cortex/pkg/chunk/series_store.go

...thub.com/cortexproject/cortex/pkg/chunk/storage_client.go

...ithub.com/cortexproject/cortex/pkg/chunk/table_manager.go

...thub.com/cortexproject/cortex/pkg/ingester/client/pool.go

...ub.com/cortexproject/cortex/pkg/util/validation/limits.go